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#91
Except that you don't have a single-user computer. You have a multi-user computer that only one human user is using.
Multi-user is not an option, and every user of windows, including you is currently right now running multiple users (at least 5 of them) on your computer simultaneously. Just not multiple human users. As such, you are dead wrong when you say "a very large number of people who are never ever gonna have more than one user on their computer", because it's impossible to NOT have more than one user.
Don't confuse Human beings who sit at a keyboard with operating system accounts called users.