Well it's getting better, and fast imo. When I started using Linux some 4 years ago I could barely play anything in my library. If the game had online functionality in any way, chances were it didn't run. That has gotten a lot better imo but Proton is still not where it needs to be. But things change and from what I, as a consumer, can see it seems like the biggest problem now are invasive Anti-Cheats rather than anything fundamentally breaking the games.

Edit: but yeah, it sucks when shit ain't working and the small fraction of stuff not working is still a bit much to swallow