Right, but as a user experience you get a phone that either annoys you into switching off all the features that can be used to bug you, or annoys you endlessly because you don't know how to switch it off, or doesn't have it on by default - in which case there's little point in implementing it all, because most will not even be aware they can switch it on.
Or you could do some kind of middle-ground like what Chrome is planning, where the user can only be prompted to enable notifications after they've reached some specific level of engagement with the site they're using: https://github.com/WICG/interventions/issues/49#issuecomment...
