Proton works great. I now play all my windows-"only" games on Linux.

Not out of principle. I'm just lazy. My coding laptop is always within reach and Proton works. The Windows laptop is, like, way over on the other side of the living room and I don't feel like spending the evening disabling more ad shit or ai shit or whatever they did to Windows since I used it last.

I have 100 or so steam games. Each one that I've tried (around 20 so far), all of them work perfectly well on my Linux box.

Except for games that use kernel level anti-cheat.