Most people who own Apple hardware have different generations of equipment in use. And because the company’s gear can last a long time, you can wind up with some old equipment—like an ancient Apple TV or Mac that’s being used to serve up video or what have you.
Apple has shifted aggressively to require two-factor authentication (2FA) with Apple ID accounts as a way of deterring account hijacking. This is admirable, though it has some adverse side effects for people who have multiple Apple IDs for historical or other purposes. (I wrote a couple of years ago about using multiple macOS accounts and other tricks to manage that.)
