I don't actually know BUT it would be amazing to start with a ranking, e.g. https://www.npr.org/2024/07/16/g-s1-9554/best-games-2024-picked-by-npr-staff , and see if 100% of those via e.g. ProtonDB API or even manually (but not ideal to stay up to date), are above a quality threshold, say Gold or Platinum (or obviously native) then tell everyone about it.
Because... if it's true that 100% of those (anti-cheat excluded) do work then even I, a gamer who runs exclusively Linux on PC and handeld, would be assuming maybe 80%.
By default yes but it's possible to do remote ML, cf https://immich.app/docs/guides/remote-machine-learning so my "ideal" setup would be all on RPi5 BUT initial ML tasks (because it's going to be > 100GB of photos at first) either directly on my PC with GPU or remotely (cf guide).