Disclaimer: I do not understand anything about any technical details.
What I know is: at work we are supposed to use VNC but many of us use Xming instead (or Cygwin X).
The VNC / Remote Desktop / "desktop over desktop" user interface is completely broken. Two window managers on my screens? No thank you.
I've used remote X for as long as I've been using Unix. I do know how this works but it does work. I'm happy to believe that X11 is an unmaintainable engineer's nightmare fixed by Wayland. But if Wayland can't do remote X in some way then it's completely useless to every work place I've been to, big and small. And no I don't care a bit about fancy 3D graphics.