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.
I don’t care what your website does, not one tiny bit. I care that the majority of websites are shit, and therefore the web platform should be as minimal and isoltated from the device as possible.
Some people feel just as passionate about OS-level notifications and location permissions, and they turn them off. You can turn them off in your browser's settings as well. You'll be okay.
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.