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people remember creating an Apple Account login and using it on their laptop, but don't understand that it's connected in fundamentally different ways.

The answer is: Because the Apple Login is not calling out for every service, including login.

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I also think that's what they meant. Alternatively, the person could've been asking why Apple hasn't made the same boneheaded mistake as MS. I wasn't sure how to interpret their question to know how to answer it.
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