Yes, that was kind of vague. I meant doing something other than watching youtube or such. Definitely work for pay qualifies, but also, say, programming or writing as a hobby that can be just as intense, but not necessarily part of your normal job for income. A programmer (in my career) needs lots of desktop space and multiple sessions (and maybe even multiple monitors) - the editor, a run-time session, probably a browser for research, calculator, reference sheet, maybe a utility to watch the database(s), and nowadays a session of facetime or zoom because you aren't in an office and are having to gather with your fellow employees in talk-talk groups remotely.
A person who writes for a living or even a hobby has the word processor, dictionary, thesaurus, browser in place of encyclopedia and more open for his/her work. A max of two open windows will not cut it for a power user. (Again, my opinion).
So, what I meant was, use for more than merely sitting on the couch and watching MacBreak Weekly on an iPad. Which I do a lot to unwind - my Mini slab is great for that - but the idea of using it to do real work, well, I liken it to trying to do your income tax on the tray table of an airliner seat.