As far as I can gather, Valve explicitly advises developers to avoid targeting Linux when building or optimizing for the Steam Deck, instead focusing on optimizing around Proton.

It's crazy that Elementary is the only OS that seems to care about these things, but that's what you get when you're the only distribution to focus on design at all.

seconding SDF. they’ve also got great resources such as a cool mastodon server/lemmy/etc. the unix shell is neat too

Only works on Ubuntu though last I heard (and not even downstream distros), which is somewhat unfortunate