Apple Intelligence is also a symptom of a bigger problem. It used to be that back in the earlier days of iOS and overall tech industry, a combination of common decency and App Store rules meant notification spam wasn't really a thing (you wouldn't consider doing it, and if you would then you may very well get booted off the store).

This meant that at the time there was frankly no need to run notifications/etc through a summarizer (or even make notifications persist after unlocking the screen).

But then Apple gave up on enforcing the rule, and the push for more "growth & engagement" meant that common decency was also out the window, so now notification spam is normal and even Apple itself engages in it to advertise Apple Music/etc.