Yes, we really need users for desktops on all operating systems. Fundamentally limiting a computer to a single user is immeasurably idiotic and I wonder how one comes to that question even.

Somehow it slipped in for phones and that’s a big part of why they suck. E.g. you can’t have work, life, private/second life and tmp/trash accounts on your phone and have to either carry multiple devices or mix lives together.