Nvidia appeared fairly buggy as of nvidia 535 and kernel 6.3 with both sway and Plasma 5.27. Notably of all the possible choices for Wayland support ONLY KDE in relatively recent releases supports proper scaling of apps using xwayland which are apt to be a thing for a while now. This is a huge point in KDE’s favor despite loving the idea of an i3 like experience with sway.
If prior experience bears out plasma 6.0 will be buggy as fuck and 6.2 will be excellent.
Nouveau has NEVER been a particularly good choice and its primary developer just resigned www.phoronix.com/news/Nouveau-Maintainer-Resigns I wouldn’t pin my hopes on it in the future becoming usable. I sure as hell wouldn’t say its a useful choice NOW because you suppose it may become so in the future. I’d rather look at nvidias official open source effort.
If I had a crystal ball to look in I bet it would say a lot of folks with existing Nvidia hardware are best off sticking with X11 in 2023 but looking again at KDE’s wayland session in 2024.
Although do bear in mind people using stable distros like Ubuntu/Mint/Debian will be a lot longer seeing new useful features pushed out.