Even (or perhaps especially) with a machine per user, it's critical to keep that user from accidentally shooting themselves in the foot. Typing sudo does help remind a user they're doing something different. I don't want to always have the right to force delete root!
Your comment seems to suggest the alternative of not installing `sudo` is to run your desktop as root. Which clearly isn't the case at all. There are plenty of "sudo" alternatives: `su -c`, `doas`, `login`, etc
Also since we're talking about running as root: ironically I've found a lot of people seem to put the following line in their sudoers file:
ALL=(ALL) NOPASSWD:ALL
which is definitely better than logging in as root....but not by a lot.
