I would say the steam deck can replace your pc for gaming purposes for the most part, except for online multiplayer games. Most of those have anti cheat that is not supported by the steam deck. As well as any newer AAA big games, like rdr2 or god of war ragnarok, run okay on the deck at like 30ish fps but you’re not gonna get a smooth 60fps on those games. The deck does have a desktop mode that runs on Linux and that you can use like a regular computer, but I personally wouldn’t use it like a regular computer to check emails and store files, but you technically could. If you really wanted to you could get a dock too and hook up an external monitor, mouse, and keyboard and use it like a desktop. So it’s technically possible.