[jon-wood]

Sadly this is caught up in the usual conflict of interests. As someone building a PWA I would love a quick and easy method to pop up an install dialogue for the user. Unfortunately as a user of Safari on iOS the last thing I want is for every single website I interact with to be popping install dialogues, and you just know that's going to be as prolific as the current bombardment of requests to subscribe to mailing lists, and on desktop enable push notifications the moment a web page is opened.

[usrusr]

The "natural" UI place for that kind of begging would not be a pop-up, but the head end of the URL bar, where the domain certificate validity is shown. Usually that's also the place where the UI for revoking permissions that are already granted is launched. Assuming the best I suspect that this is already the future plan of browser makers: on both browsers I usr (android chrome and FF on the desktop) hair the begging pop-up point there already, perhaps this is not only done as a hint to the place where the permission can be revoked, but also as training wheels for a less annoying future where the pop-up is replaced with some simple notification state in that place?

[hn_throwaway_99]

As an Android user I don't feel bombarded by install requests, so I don't really know what you're talking about.