We can delete Oneplus default app using adb. Here's the app list of ACE2

Oneplus_ace2_default_apps

$ ./adb shell pm list package

package:android.framework.res.overlay.domestic
package:com.oppo.instant.local.service
package:com.oplus.framework_bluetooth.overlay
package:com.coloros.karaoke
package:com.qti.phone
package:com.oplus.atlas
package:com.android.modulemetadata
package:com.android.connectivity.resources
package:com.oplus.exserviceui
package:com.android.systemui.overlay.fingerprint.anim.none
package:com.achievo.vipshop
package:com.coloros.backuprestore
package:com.oplus.omoji
package:com.android.calllogbackup
package:com.android.carrierconfig.overlay
package:com.coloros.calendar
package:com.rongcard.eidapi
package:cn.wps.moffice.lite
package:com.qualcomm.qti.lpa
package:com.qualcomm.atfwd
package:com.qualcomm.qti.cne
package:com.oplus.logkit
package:com.oplus.ovoicemanager.wakeup
package:com.android.providers.contacts
package:com.qualcomm.uimremoteserver
package:com.oplus.cosa
package:com.android.dreams.basic
package:com.android.companiondevicemanager
package:com.android.cts.priv.ctsshim
package:com.android.launcher
package:com.android.mms.service
package:com.daemon.shelper
package:com.android.providers.downloads
package:com.android.bluetoothmidiservice
package:com.google.android.printservice.recommendation
package:com.sina.weibo
package:oplus
package:com.android.systemui.overlay.fingerprint.anim.ccyh
package:com.android.keychain
package:android.frameworkres.overlay.Network
package:com.oplus.aiunit
package:com.coloros.filemanager
package:com.qti.service.colorservice
package:com.oplus.stdsp
package:com.heytap.quicksearchbox
package:com.qualcomm.qti.devicestatisticsservice
package:com.android.shell
package:com.heytap.market
package:com.oplus.lfeh
package:com.coloros.weather2
package:com.oplus.eyeprotect
package:com.oplus.acc.gac
package:com.jingdong.app.mall
package:com.oplus.ocloud
package:com.xunmeng.pinduoduo
package:com.android.inputdevices
package:com.oplus.bttestmode
package:com.heytap.cloud
package:com.heytap.health
package:com.qti.qualcomm.datastatusnotification
package:com.heytap.openid
package:com.oplus.securitykeyboard
package:com.android.bookmarkprovider
package:com.qti.dpmserviceapp
package:com.google.android.onetimeinitializer
package:com.android.apps.tag
package:com.android.sharedstoragebackup
package:com.oplus.dmp
package:com.qualcomm.qti.uimGbaApp
package:com.android.wifi.resources.overlay.taro
package:com.android.providers.media
package:com.coloros.codebook
package:com.android.providers.calendar
package:com.oplus.engineernetwork
package:com.android.incallui
package:com.android.providers.blockednumber
package:com.opos.ads
package:com.android.networkstack.tethering.inprocess
package:com.android.statementservice
package:com.google.android.cellbroadcastreceiver.overlay
package:com.android.bluetooth.oplus.overlay
package:com.wuba
package:com.qualcomm.qti.ims
package:com.android.proxyhandler
package:com.qualcomm.qti.modemtestmode
package:com.android.cellbroadcastreceiver.overlay.common
package:com.oplus.uiengine
package:com.coloros.phonemanager
package:com.oplus.ota
package:com.coloros.scenemode
package:com.android.safetycenter.resources
package:com.android.managedprovisioning
package:com.oplus.ocs
package:com.oplus.appdetail
package:com.oplus.nas
package:aon.frameworkres.overlay.display.product
package:com.oplus.trafficmonitor
package:com.heytap.smarthome
package:com.oneplus.bbs
package:com.android.cellbroadcastreceiver.module
package:com.qualcomm.location
package:com.qualcomm.qti.gpudrivers.taro.api32
package:com.android.carrierdefaultapp
package:com.coloros.activation
package:com.unionpay.tsmservice
package:com.nearme.instant.platform
package:com.android.backupconfirm
package:com.android.nfc
package:com.oplus.healthservice
package:com.android.carrierconfig.overlay.common
package:com.android.cellbroadcastservice
package:com.android.mtp
package:com.oplus.portrait
package:com.google.android.gsf
package:com.coloros.digitalwellbeing
package:com.oplus.appplatform
package:com.oplus.deepthinker
package:com.eg.android.AlipayGphone
package:com.heytap.htms
package:com.oplus.crashbox
package:com.heytap.accessory
package:com.heytap.colorfulengine
package:com.android.internal.display.cutout.emulation.double
package:com.android.theme.font.notoserifsource
package:com.qualcomm.qti.remoteSimlockAuth
package:com.oplus.obrain
package:com.oplus.linker
package:com.oplus.onetrace
package:com.oplus.ovoicemanager
package:com.android.systemui.overlay.charging.anim.siphon_wireless
package:com.android.server.telecom.overlay.common
package:com.oplus.notificationmanager
package:com.wapi.wapicertmanage
package:com.qti.ltebc
package:com.heytap.pictorial
package:com.oplus.synergy
package:com.google.android.cellbroadcastservice.overlay
package:com.oplus.framework.rro.oneplus
package:com.qualcomm.qti.xrvd.service
package:com.qualcomm.qti.xrcb
package:com.oplus.gesture
package:com.baidu.input_oppo
package:com.ted.number
package:com.oplus.athena
package:com.taobao.taobao
package:android.systemuithreekey.overlay.product
package:com.oplus.consumerIRApp
package:com.oplus.location
package:com.android.systemui.overlay.fingerprint.anim.xw
package:com.coloros.shortcuts
package:com.oplus.engineermode
package:com.coloros.translate
package:com.android.systemui
package:com.oppo.ctautoregist
package:com.google.ar.core
package:com.oplus.ether
package:com.coloros.mapcom.frame
package:com.qualcomm.qti.uceShimService
package:com.android.internal.systemui.navbar.gestural
package:com.oplus.pay
package:com.qti.dcf
package:com.android.settings.intelligence
package:com.iflytek.speechsuite
package:com.qualcomm.timeservice
package:com.fido.fido2client
package:com.oplus.wifitest
package:com.qti.confuridialer
package:com.qualcomm.wfd.service
package:vendor.qti.imsrcs
package:com.oplus.melody
package:com.heytap.themestore
package:com.google.android.webview
package:com.coloros.note
package:com.android.wallpaperbackup
package:com.coloros.directui
package:com.google.android.networkstack.overlay
package:com.android.internal.systemui.navbar.threebutton
package:com.android.egg
package:com.android.localtransport
package:com.coloros.colordirectservice
package:com.android.systemui.overlay.fingerprint.anim.jslz
package:android
package:com.android.email
package:com.android.permissioncontroller
package:com.android.wifi.resources.overlay.oplus
package:com.qualcomm.qti.dynamicddsservice
package:com.oplus.thirdkit
package:android.frameworkres.overlay.display.product
package:com.oplus.multiapp
package:com.android.se
package:com.android.pacprocessor
package:com.oplus.nrMode
package:com.oplus.sau
package:com.coloros.soundrecorder
package:com.android.providers.media.module
package:com.redteamobile.roaming
package:com.qualcomm.embms
package:com.oplus.sauhelper
package:com.android.stk
package:com.oplus.customize.coreapp
package:com.oplus.securitypermission
package:com.oplus.wirelesssettings
package:com.oplus.aod
package:com.heytap.music
package:com.android.internal.display.cutout.emulation.hole
package:com.android.settings
package:com.android.bips
package:com.oplus.nhs
package:com.qualcomm.qti.telephonyservice
package:com.coloros.ocrservice
package:com.android.internal.systemui.navbar.gestural_narrow_back
package:com.zhihu.android
package:com.android.internal.display.cutout.emulation.tall
package:com.coloros.remoteguardservice
package:com.oplus.postmanservice
package:com.android.cameraextensions
package:com.coloros.calculator
package:com.oplus.safecenter
package:com.coloros.weather.service
package:com.baidu.searchbox
package:com.coloros.securepay
package:com.android.carrierconfig
package:com.android.internal.systemui.navbar.gestural_wide_back
package:com.heytap.vip
package:com.oplus.metis
package:com.qualcomm.qti.simcontacts
package:com.oplus.exsystemservice
package:com.aiunit.aon
package:com.google.android.ext.shared
package:com.android.networkstack.inprocess
package:com.coloros.floatassistant
package:com.autonavi.minimap
package:org.codeaurora.ims
package:com.android.remoteprovisioner
package:com.qualcomm.qcrilmsgtunnel
package:android.overlay.common
package:com.coloros.childrenspace
package:com.coloros.favorite
package:com.fido.uafclient
package:com.oplus.onet
package:com.oplus.olc
package:com.android.documentsui
package:com.coloros.ocrscanner
package:com.android.adservices.api
package:com.coloros.smartlock
package:com.coloros.smartsidebar
package:com.coloros.alarmclock
package:com.coloros.accessibilityassistant
package:com.android.smspush
package:com.google.android.marvin.talkback
package:vendor.qti.hardware.cacert.server
package:com.coloros.healthcheck
package:com.oplus.wallpapers
package:com.android.providers.downloads.ui
package:com.qualcomm.qti.performancemode
package:com.android.ons
package:com.oplus.screenshot
package:com.heytap.opluscarlink
package:com.coloros.oshare
package:com.coloros.compass2
package:com.android.certinstaller
package:android.ext.services
package:com.qualcomm.uimremoteclient
package:com.oplus.wifibackuprestore
package:com.android.wifi.resources
package:com.android.wifi.dialog
package:com.android.captiveportallogin
package:com.coloros.gallery3d
package:com.android.systemui.overlay.fingerprint.anim.fy
package:com.coloros.systemclone
package:com.oplus.interconnectcollectkit
package:com.coloros.translate.engine
package:com.qualcomm.qti.powersavemode
package:com.oplus.encryption
package:com.android.simappdialog
package:tv.danmaku.bili
package:com.oplus.blacklistapp
package:com.coloros.securityguard
package:com.android.providers.telephony
package:com.coloros.operationManual
package:com.ximalaya.ting.android
package:com.android.wallpaper.livepicker
package:com.tencent.qqlive
package:com.android.systemui.overlay.common
package:com.fido.asm
package:com.oplus.phonenoareainquire
package:com.android.sdksandbox
package:com.oplus.statistics.rom
package:com.qualcomm.qti.poweroffalarm
package:com.ss.android.ugc.aweme
package:com.android.internal.display.cutout.emulation.waterfall
package:com.dragon.read
package:com.android.providers.settings
package:vendor.qti.iwlan
package:com.android.phone
package:com.android.connectivity.resources.overlay.oplus
package:com.oplus.powermonitor
package:com.android.internal.systemui.navbar.gestural_extra_wide_back
package:com.oplus.smartengine
package:com.android.traceur
package:com.android.contacts
package:com.heytap.reader
package:com.oplus.audio.effectcenter
package:com.oplus.screenrecorder
package:com.oplus.engineercamera
package:com.oplus.vdc
package:com.android.location.fused
package:com.android.vpndialogs
package:com.android.uwb.resources
package:com.android.cellbroadcastreceiver
package:com.android.phone.overlay.oplus
package:com.heytap.browser
package:com.coloros.sceneservice
package:com.android.settings.overlay.common
package:com.android.wifi.resources.overlay.common
package:com.qualcomm.qtil.btdsda
package:com.heytap.mydevices
package:com.android.phone.overlay.common
package:com.coloros.assistantscreen
package:com.smile.gifmaker
package:com.android.ondevicepersonalization.services
package:com.oplus.battery
package:com.android.htmlviewer
package:com.heytap.mcs
package:com.android.vending
package:com.coloros.familyguard
package:com.google.android.configupdater
package:com.oplus.cast
package:com.coloros.sharescreen
package:android.overlay.target
package:com.ss.android.article.news
package:com.qti.qcc
package:com.android.mms
package:com.android.providers.userdictionary
package:com.google.android.overlay.gmsconfig.common
package:com.android.cts.ctsshim
package:com.android.bluetooth
package:com.coloros.findmyphone
package:android.frameworkres.overlay
package:com.amap.android.location
package:com.finshell.wallet
package:com.oplus.play
package:com.oppo.store
package:com.qualcomm.qti.workloadclassifier
package:com.android.internal.display.cutout.emulation.corner
package:com.oplus.camera
package:com.google.android.gms
package:com.android.storagemanager
package:com.sohu.inputmethod.sogouoem
package:com.android.packageinstaller
package:com.android.systemui.overlay.fingerprint.anim.sw
package:com.nearme.gamecenter
package:com.coloros.bootreg
package:com.oplus.subsys
package:com.android.printspooler
package:com.oplus.uxdesign
package:com.android.wifi.resources.overlay.target
package:com.qualcomm.qti.seccamservice
package:com.oplus.ocar
package:com.qualcomm.qti.uim
package:com.oplus.qualityprotect
package:com.heytap.speechassist
package:com.android.dynsystem
package:com.heytap.yoli
package:com.oplus.upgradeguide
package:com.oneplus.brickmode
package:com.tencent.soter.soterserver
package:com.oplus.romupdate
package:com.oplus.sos
package:com.oplus.apprecover
package:com.android.hotspot2.osulogin
package:com.oplus.games
package:com.android.systemui.overlay.fingerprint.anim.xklc
package:com.android.externalstorage
package:com.coloros.smartdrive
package:com.android.server.telecom
package:com.android.carrierconfig.oplus.overlay

Notice that device won't boot if uninstall com.oplus.exsystemservice! tested on ColorOS 14, you can only erase your device get your phone back with the cost of loosing all your data one the phone Don't ask me why. TAT

if you enabled adb before, you can connect to the device you have authorised and run
adb shell pm install-existing --user 0 com.oplus.exsystemservice
adb shell pm unsuspend com.oplus.exsystemservice
adb shell pm enable com.oplus.exsystemservice

hope can help someone who run into this, by this way you don't need to lose your data