Why can’t I choose to trust Apple for iOS and another developer for other functionality that runs on iOS?

We do this all the time. I don’t uniquely depend on Microsoft for stuff that runs on Windows. Same for stuff that runs on macOS. And on Linux I’m not even sure who I’m trusting from the ground up other than a huge and disparate collection of people.

So what makes iOS so unique that it can’t run PWAs, which is little more than adding some chrome and a handful of APIs to already pre-existing browser capabilities.

What an F’ing joke. And the bigger joke are the Apple fans who are going out of their way to defend Apple sticking it up their nether parts.