Push notifications.
> Integration with OS features is what made the app ecosystem, because of utility.
This is true of some apps, like the beer-drinking one that uses the accelerometer / other orientation sensors.
It's not true of a large number of other apps, hence the "your app could have been a webpage" charge. This is distinct from "every app could be a webpage".
https://developer.mozilla.org/en-US/docs/Web/API/Push_API
> hence the "your app could have been a webpage" charge
No debate there. I was responding to the ever vague and broad "they want" comments.
Responding but never answering to anything. You were asking a bunch of questions with obvious answers that you should have known or could have discovered yourself, but expected others to dig out and chew them for you. You even went to ridiculous lengths to pretend that apps only do things "because of utility" and everything else like data collection, tracking, ads, etc. is "conspiracy". That's negative value in a conversation.