That's funny, because for me, it's exactly the opposite. I use Gnome on Wayland/Mutter and it works great - I've never had a linux desktop that had such great UI rendering. Gnome on X doesn't work and is buggy - it's riddled with graphical glitches that other platforms (even smartphones and tablets) don't suffer from. How can that be considered to "work"?
That would be pretty amazing if Xorg ever rendered in a way that was even equal to other platforms (mutter, Windows, android, MacOS, ...) given how crazy the separation of concerns in X is and how many silly boundary crossings need to be made to process events and render them.
It would have to rely on compositor and driver bugs in those other platforms.
But my requirements are different from yours.