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.
Finally did it a few days ago. Not only gaming (and emulation in general) is more fluid, but the sheer amount of customization available makes me never want to go back to Windows.