If you ever interview apple developers for other companies, or just inspect what is being sent to apple's servers constantly from their devices, you'll realize that apple is recording A LOT of very private info about their users.
Apple is very much a 'private from everyone but apple' company, they smartly just don't talk about it out loud. For their high level apps like TV and such, have things like privacy review. But their security, activation and map parts do record a lot of info.
Maybe that will work in practice but you have no way of knowing if it does. There is nothing really preventing Apple from sneaking tracking data through the notification channel (not to mention that centralized notifications are already a juicy opportunity to profile and track users) or retaining the data and sending it off when you do OS updates. Once a company has shown willingness to go against your interest you can't really trust them. The only real solution is to use software that respects you and increasingly that means only open source software.
If a large corporation officially advertises to enterprise customers a bounded, testable claim (e.g. traffic to these IP addresses is limited to notifications), then that claim can be subject to ongoing audit by the IT teams of multiple, independent, enterprises.
Verified accountability is far superior to trust. Step 1: vendor corporation makes a bounded, testable, claim.
Apple is very much a 'private from everyone but apple' company, they smartly just don't talk about it out loud. For their high level apps like TV and such, have things like privacy review. But their security, activation and map parts do record a lot of info.