[WCSTombs]

On my own computers I typically have the two logins you mentioned, the user and the root account, since there's only one of me and only I use the computers. On the computer I recently had for work there were many accounts, since the sysadmins sometimes needed to SSH in. I also selectively added accounts for some of my coworkers as needed.

If I lived with any family, making non-sudoer accounts for them on at least some of the machines would seem like a pretty normal thing.