Proton DB is the place to go. But I don’t check 99% of games I play, unless it’s going to be an expensive purchase and I want to check before I buy. I also don’t bother with people’s suggested tweaks on proton db unless I actually personally experience issues. The only game I’ve had to tweak so far has been cyberpunk 2077.
Edit: added context, I’m on 2 monitors and one of them is an ultrawide. Never had any issues that aren’t similar to issues I’ve experienced on Windows in the past.
Future cosmetics will also be available in both games. Not sure about past ones. They’re doing a fantastic job, and hopefully that continues.