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.
Wine developers. Yes, Valve/Proton has given it a big boost in the last few years but the Wine project has been under steady development for 30 years, almost as long as Linux itself. I remember trying it for the first time back in the day and being amazed that it could run Minesweeper.