Have you ever tried to use Windows as a limited user? It's a nightmare. It's "supported" but I can't imagine they actually expect people to use it that way.

Why is the first account you create an admin account by default. If they wanted the use-case that you imply is supported, they would have you create an administrator account and then would ask you to create a regular user to use day-to-day.

Or they would more fully embrace the su/sudo routine that linux uses.