it seems things have improved dramatically.

Like maxo said, things are definitely waaaaaaaay better than 10 years ago.
I'd say roughly 80% of my windows only games run as good as on windows, and probably 25-30% of my full library (not just what runs in proton) runs better in Linux with proton/wine than they do in win11.
Mostly what doesn't work is stuff with kernel level anticheat.