You should be able to select “GE-Proton(Latest)” as your runner in Lutris. But if its missing for some reason, https://github.com/gloriouseggroll/proton-ge-custom
I haven’t noticed any major issues between using Lutris and Steam for the games I play.
Whatever the box says.
I’ve tried to cheat fate before by being just 50w under the label and got screwed for it.