Valve has a fun solution for the Steam Deck, which is shipping pre-compiled shaders for your device across the wire that get installed along with the game. I'm curious to see whether that will become more widespread eventually.

That's still pre-warming. Sometimes you can target hardware and do it at dev time but its the essentially the same process.

I assume other Steam Deck like hardware which is a fixed target could support it, apparently the Legion Go S is going to ship with Steam OS rather than Windows.

On PC hardware it seems unlikely, more chance of Epic fixing their engine.

Yeah the fixed hardware is key here. The PS5 doesn’t have to compile shaders at app launch time either.