I know about XWayland, but trying to go to war to modify an infinite number of random window managers and the ecosystem of tools that plugged into the X backend

I know about XWayland, but trying to go to war to modify an infinite number of random window managers and the ecosystem of tools that plugged into the X backend is, to me, the thing which should have been avoided by thinking about the project more as a massive rearchitecting of the stack. If you do build that -- even if it is kind of difficult, though frankly I can't imagine it is actually HARD and not merely BORING (which is a big problem with software developers where they conflate that: most of the job is, in fact, boring, and you have to embrace that) -- you could just delete the X codebase as you expanded hardware support, rather than being stuck in some weird limbo where a bunch of tooling out there is still having to be ported or even rebuilt for Wayland.