I’m running it on NixOS. The Steam Deck experience is significantly more rich in terms of features like overlays etc. but the games play just as well on my NixOS desktop. In fact Proton etc. is so good atm there’s no point in having Windows. Only game I know that doesn’t work is Fortnite, and luckily that’s not a genre I enjoy.
Hopefully will not be the case. Depends on whether buy-in from Heroic, Bottles, and Lutris maintainers have been secured