Wayland wasn't in scope of "use cases actually paying for Linux support" (whether directly or transitively) and I wouldn't be surprised if majority of targeted supported applications don't support running under Wayland. The professional market is only now starting to do its toes into dealing with Wayland and that's mostly because RHEL9 defaults to it.

Also, it's not like Wayland offered a concrete target to support, different approaches of how to actually provide device context to applications were from beginning a "now draw the rest of the owl" thing.