That's more or less my use-case. It's a way for me to play games in situations I couldn't easily before -- outside, traveling, on the couch while someone else uses the TV, in bed, etc.If you already have a PC, in my mind Steam Deck isn't meant to replace your PC but augment it so you can play games in ways you couldn't before.
Steam Link and Remote Play already did a lot to expand this to just about every screen in my home, but I never really got a phone + controller setup that I liked enough for a mobile setup. The Steam Deck will make for a great handheld experience, and I don't have to rely on streaming. Plus, it's a full-fledged Linux PC.
So, all together my setups will probably look like:
- Primary Desktop Setup (Local)
- Primary Lounge Setup (Local off of Desktop PC)
- Secondary Lounge Setups across various rooms (Streaming)
- Handheld (Local, Streaming)
It's really nice to just be able to play your games wherever and however you want.