I think Wayland is about as feature complete as it's gonna get at this point. Mutter, Kwin are still working on adding features to support workflows that relied on the loosey-goosey nature of Xorg. Like Xorg never had "support" for global hotkeys or screen sharing. It's just that programs were allowed access to all inputs and the screen buffer. Designing a system where only some programs are allowed to do that isn't trivial.