That’s one very long discussion so no idea what part you are referring people to, but there is an issue with various apps that don’t support push notifications. So those that run as web apps have this issue, as do many apps on iOS where they also don’t subscribe to use the OEM’s push notification system eg. like iQuassel. So yes, great to distribute via a 3rd party service but many users again see it as a non-starter if they won’t get push notifications. True that a lazier dev can just use the Google of iOS push notification system, which of course requires their users to use those app stores then to get the app.