Steam is a godsend for Linux. I no longer have to even check where a game plays, I know that a Steam game will play on Linux. Nowadays I buy games mostly as thanks to Valve's Linux efforts, as I don't really tend to game much.

It's still not every game, checking protondb before buying is good advice.

That's true, that's oversimplification on my part. I tend to like older, non-AAA games, and I haven't had a single one of those fail so far.