> You don't need an account to start a car, …

Don’t say this too loud please, I don’t honestly think we’re too far from this reality, at least from an “Overton Window” point of view.

What's the "user account" for an iPhone? Sure you might have to sign into icloud, but that's not mandatory. It's effectively a single user system.

The "User account" of the OS are the security contexts. You can say everything should be a single security context, and this is how a lot of people have been operating their MS Windows machines, logging in as admin constantly, but this is a stupid idea and comes with risks. Even when you say the OS can have a second root account, that the user never gets to use, you have two user accounts.

Growing up, I vividly remember user accounts being important for our families personas on Windows XP. There's definitely a place for them, but there should be an option to not use one.

Unless your specifically calling out accounts that require online registration for the OS. I'm vehemently against that requirement.