I bought a steam deck primarily to have a PC hooked up to my TV. My main use case is watching live pirated sports streams. I tried a Raspberry Pi, and it just didn't have enough power. It kept getting micro stutters, which made it unwatchable. I figured having a decent integrated GPU would help immensely with video decode.

And then when I got the steam deck, I installed emulators and got a bunch of roms, and now I play classic games with my wife.

And then I learned about moonlight. My gaming PC is in another room, but now I could play any game on the TV in the living room with moonlight.

So those are my three main use cases. I brought my Steam Deck on my last three trips but didn't even open it the case. I guess I'm just not really into gaming on the go.