The last time I ran Linux on my main gaming rig I had a couple of key problems that largely made me call it quits:
Games with gold and platinum ratings on WineDB (this was about the time Proton was newly released) would require far too much fiddling to get working if I could get them working at all.
A couple of fairly uncommon games I played a lot at the time had weird issues with user-generated content related to filesystem and library case-sensitivity differences.
Game crashes from content conflicts more often than not created system crashes, which both obscured crash dialogues which would normally point me to the content to explore why it was crashing, and extended the amount of time needed to troubleshoot an install and get it working
I’ll probably try it again at some point in the next handful of years, especially since the Linux desktop has come so far in the 3 years or so since I last tried it out. I already run Linux on about half of the systems I use regularly, so its not like I’m completely out of the game.