And this can be perceived as - arguably - restrictive and user-hostile by some.
As far as I can tell from reading the article, all it does is say, "Hey, did you know you've been carrying around a tracker that's not yours?" Your cat or your luggage don't care if you attach a tracker to them. Your ex does.
Just go buy some other tracker for your cat or whatever.
Current GPS collars are absolutely trash (3 day battery life, bulky, etc), this would be about 10,000 times better if effective. But if it starts beeping randomly unprompted and scares the dog, it's a problem.
Everyone has their own needs, requirements and ideas what's essential and what's not. Importance and justifications are subjective matters.
Only thing everyone can certainly agree on that those use cases were not deemed important (or even considered) by Apple, as they would've designed it differently otherwise.
Apple's trying to prevent misuse of their device. They want you to use it to find your keys, not your ex. If you consider that an invalid limitation of your device (by notifying your ex that they seem to be carrying an unknown tracker)... well, let's just say I disagree.