Because there are way too many spouses who go to as absurd lengths as setting private investigators on their partners. Stalking is just as much a concern inside families as it is for everyday persons - I might be tempted to say that the impact is worse given the potential for domestic violence. Or just imagine fundamentalist parents tracking their children to Planned Parenthood, a known LGBT-friendly place or whatever.
Ideally, there would be laws and regulations on trackers - and not just hardware-ones like the AirTags, but also software-based ones - that mandate features to prevent abuse, but sadly politicians haven't caught up on tech developments yet.
Coercion, simple as that.
If A had to coerce B to turn of the alert, then the alert would have already served its purpose to tell B that they're being tracked by A. Moreover, there should still be some interface which B can use to figure out which AirTag is following them, so person B would 1) know that A is tracking them in general, and 2) have the ability to check whether A is tracking them in the moment.
Please explain what additional information or utility the continued notification is giving person B in this moment, or if my understanding of the hypothetical is wrong.
I want to track the dog, the shared cars’ keys. I want to track a shared bike. There are a load of items I’d put them on, but they aren’t just mine.
I don’t believe it’s a security thing. It’s the Apple way to get software to a point then just stop development, there are plenty of examples.