Considering Waylands history with lacking screen capture support and the amount of work that's gone into creating plugins like https://hg.sr.ht/~scoopta/wlrobs to support screen capture for wlroots based Wayland compositors this really doesn't looked like something OBS can or should fix. Until there's a standard way for applications to actually do screen capture similarly to X, Wayland is going to continue to be stuck as the 2nd choice for a lot (most) people.

Not to mention all the other things that don't work on Wayland, like VM key capture and Peek's event passthrough.

You seem to project your own biases on the OBS developers. However there is already work being done for OBS supporting Wayland natively[1].

[1] https://github.com/obsproject/obs-studio/pull/2482

Discord and Peek are able to capture the screen fine.

The whole design behind Peek is that you have a transparent window that shows you what is being recorded and you can interact with the window behind it to record something useful. Passing through events to the window behind it only works on X11 (or XWayland).

Are you sure you can share Wayland windows? To my knowledge screen sharing support for Electron apps is experimental or hasn't landed yet.

Xwayland windows (most games and Discord itself would fall into this category) can be shared.