ProtonDB is a great resource for tweaks like you suggested and I find proton works OOTB quite often. But I agree, they seem to be operating under an alternate definition of what "platinum" means which is setting everyone's expectations to high.

I'm happy to edit to correct, but my own experience on Steam Deck has been that anything that's platinum (or native, but that goes without saying) basically just works, minor UI issues and the like notwithstanding. Considering that even Windows versions can have those kinds of issues depending on drivers and hardware, I figured it was a fair comparison.