We are a family of five and share devices. The tablet has profiles that just switch locally. The switch asks before you start a game which profile to use. The steam deck not only doesn’t properly separate profiles, so you end up accidentally overwriting each other’s save files, it also goes through that whole login process every time you switch them, which doesn’t work if you’re disconnected. So yeah, the deck doesn’t work as well as other devices if it’s disconnected. It’s not that out doesn’t work at all, I know, but profiles and iirc achievements as well just don’t properly do their thing.