I've played Deus Ex (and the revision mod) and Splinter Cell: Chaos Theory on Linux without issue. If you're playing steam games it's basically just install and play. Especially for old games.
There's a website called protondb.com you can check for compatibility. Gaming on Linux is so good now though, I don't even check anymore before buying games.
Word of warning though. While modding games running through wine/proton is possible, mod managers don't usually work or are tedious to set up. I don't mod too much so I usually just manually install or stick with steam workshop mods.
I feel with you but I think it also brought some benefits. Finding time to meet up with my friends has become harder and harder with everyone growing up, studying, getting jobs.
The influx of people during covid catapulted the virtual tabletop solutions ahead and now we regularly play again using foundry vtt since everyone can just sit at home.
But yeah, online everyone just talks about DnD or Critical Roll it feels like and unless you're on reddit there's very few communities left.