I’ve been using wayland via Plasma for at least a year now and it’s been rock-solid. Granted, I have an AMD card and KDE is NixOS’ primary DE.

If you run Gnome you’ll run into compatibility issues as Gnome devs have a “our way or the highway” kind of attitude. Like steadfastly refusing to implement server-side decorations. They want to use CSD for their stuff, that’s not an issue, but it’s another issue to not allow random programs to say “hey, server, I don’t care about my decorations, paint something suitable”. Especially for programs like mpv which don’t have a toolkit that could do such a thing for them, and mpv is not going to start linking to qt or gtk just to draw a title bar.