I have nearly 1000 games on steam the only ones that don’t work on proton with zero fiddling at this point are either EAC/BattleEYE games that don’t support proton. Or old games from the early 00s with drm that also don’t really work on windows anymore either.
I am also on Manjaro.
CVS near me gives you a store credit if you let them email your receipt to you. It’s silly.