Mainly that. I want to be able to have multiple terminal windows open and have them stay open independent of my main PC. Part of the reason I have a file server instead of plugging all the drives into my PC is so I can offload processor heavy operations onto it (namely making archives and compressing files for long term storage) so I don’t have to use my PC for that.
People have mentioned programs like screen but IMO it’s way more annoying to juggle multiple terminals with it than if they were just windows, and also screen doesn’t scroll so whatever goes beyond the top edge is just inaccessible which I find really annoying. I’ve also been screwed by mistyped file operations on the terminal before (deleting stuff I didn’t mean to mainly) and I just find it safer to use a GUI file manager where it’s a lot harder to subtly mess something up and not notice until it’s too late.