Earlier quoted context omitted.
No problem, the biggest ones I tried were Godot, Krita, and Steam. Godot does not run on Wayland although support seems to be planned somewhere down the pipeline. Krita "runs" on Wayland but a lot of the features do not work nor does pen support last time I checked. Steam just doesn't work. Edit: A commenter on this thread mentioned Emacs. I have not tried that as I have recently switched to Emacs but if that is true…
I have a Linux PC that my kids mostly use, running Wayland sessions. It definitely works with Steam and Krita, although I admit that I do not know if all of Krita's features work. They have played Portal 2, Minecraft, and a few "windows-only" games with Proton. My biggest gripe is that if you have more than one window of Chrome open it gets VERY slow. Multiple tabs are good, multiple windows are not.
"It's a perfect compositor, as long as it is not expected to composite." ;)
Personally I need the ability to open a remote window on my desktop, fingers crossed that someone will add that.