There's still room for improvement, but Linux gaming has come a long way in a short time.
I remember when Proton launched it was like magic playing games like Doom and Nier Automata straight from the Linux Steam client with excellent performance. I do not miss the days of having the Windows version of Steam installed separately.
I've gradually gone from being peeved at Proton for not being able to support certain brands of anti-cheat, to actively avoiding games with anti-cheat solutions that are fundamentally incompatible with Proton.