Having to test your gem on your host app after having to commit changes to your gem... and then having to rebundle your gemfile ... which forces you to refer to your gem-in-process like:
gem 'nfg_ui', git: 'https://github.com/network-for-good/nfg_ui', branch: 'feature/some_feature_branch_that_im_working_on'
And then have to:
$ bundle update gem_name`