You can't really use Wayland with Nvidia. Whether it'll ever be possible will be up to Nvidia...if they release open source drivers, then it will. Otherwise, no chance. I have a 3080 and use Manjaro XFCE. Gaming is nearly flawless. But it's not Wayland.
Couldn't judge sunshine etc. as I don't stream.
Generally, I'd say you'll do much better with AMD on Linux, if you don't rely on Nvidia specific features.