This fucking sucks.
So they're just going to throw away anyone who needs custom screen resolutions? Window shading/rollup-into-the-titlebar (unless they've fixed that)? Turning off a PS4 controller's trackpad with xinput? Setting HDMI full/limited color range? Whole-display scaling (not widget toolkit scaling)?
Wayland is not ready, and at this point it'll never be ready because the attitude for anything even slightly out of the "ordinary desktop with no display or input tweaks needed" is always "oh that's out of scope, no one cares about you", and the solution is NOT "welp it sucks to be you then, it's THE FUTURE get with the program".
-- Frost