Download game, enable offline mode on your steam deck for vacation.
Open game on the plane, in offline mode, get booted from game because you can’t log in.
Megaman battle network got me this way. Switched to emulator and played the same game before it was enshittified.
Big if true! Thanks for sharing, I’ll keep an eye out. The closest thing I’ve seen is Halo Infinite making the highres textures a free dlc