I think you're missing my point. It doesn't matter if Firefox supports it, Safari on my iPhone does not. Native apps do support all of these annoying features.

Let me give you an example. The official reddit app on my phone asks me maybe two or three times per week "Please enable push notifications". No. I don't want to do that. And I can't seem to get it to stop asking me. But on the website, in my browser, it's never asked me that. Because it can't. It's not allowed to. I'm not talking "is it technically possible from a pure theoretical standpoint", I mean in practice, is it physically possible for a web page on my iPhone to send push notifications and tear up my battery in the background? And I'm pretty sure the answer is "no". And that makes me very happy.