Coverage is still partial because some VERY popular games do not run on Linux due to anti-cheat
Weird. I've been playing many multiplayer shooters from Proton with my Windows-using friends. I suppose this is one of those "am I friends with people who pretty much only play CoD or Fortnite?" things.
One that people keep commenting on is Battlefield 6, which has an absolutely perfect user experience in Linux.
If you play it on Windows it's a slow, buggy, crashy, half-finished mess that barely works is just no fun at all.
On Linux, it's perfect. It doesn't work at all, so you don't waste any time trying to enjoy the slow, buggy, crashy, half-finished mess.