> unless you hook a screen and keyboard to it, I suppose.

You can run Steam Deck in "Desktop mode" without hooking a screen and keyboard to it, and it will be running a full Desktop Linux environment.

If I plug a screen and keyboard to my Android, it's still a mobile OS (e.g. made to run with a touch screen). Samsung has apparently "dex" and Google is working on convergence as well, but this is not yet a thing.

I'm looking forward to being able to hook a screen and keyboard to an Android phone and have it behave like a Desktop Android, though :-).