I mainly use mine for gaming because I have a desktop and a laptop too, but I don't see any reason why you couldn't use it as a decent semi-portable computer. It probably won't be as convenient is a laptop when it comes to typing on the go, and it certainly won't be as powerful as a desktop, but gaming on a Steam Deck is an absolute joy.
You'll definitely want some kind of dock, a monitor, a keyboard and a mouse.
It panned out for me. I used to check Twitter everyday, but now I haven't even looked at it in weeks. The Fediverse is the healthier alternative that's better for me, better for the internet, and better for society in general.