Absolutely nothing listed on that site as unsupported by Safari has any business being part of the web. In fact several supported APIs should be chucked too. Fuck giving websites motion data or push notifications.
Push notifications are the #1 featured requests of my online community. Some even switched to Android over it.
And people don't understand adding sites to their homescreen, especially since Apple buried that feature in the Share menu.
No Android user of my website ever complained about the WebPush notifications.
That sounds like the market working, no? Some people like how Apple does things, so they stick with Apple. Others prefer Android, so they switch.
The point is that users should have choice, not force users to bend to the will of malicious developers.