I use it as a general purpose computer. I set up an encrypted home partition by more or less following this guide: https://github.com/hirak99/steam_deck_encryption. I have a bag that nicely fits the deck, charging cable, dock, and a 60% keyboard for travel.
I just picked up a 144hz USB-C 16" monitor with a magnetic cover like a tablet. Paired it with a mini tripod and designed/printed a magnetic bracket so the monitor just snaps on. Slides right into my tiny 13L pack (barely).
And yes, it's a mobile workstation for me. I typically use code-server, so I'll have VSCode open in the top, and everything else on the bottom. Works well since it's width-saving in a coffee shop. I tried one of those "triple monitor" setups that connect to the laptop screen, and the angle was awful, no idea how people use those. Love me some triple-curved at home, though ;)