Thanks for posting that. I'm no iOS expert but it actually sounds like a pretty reasonable explanation. It's at least good to hear Apple's side here, and more knowledgeable commenters here can weigh in as to whether it really does seem genuine.
- No App Store review
- Full control of distribution channel
- Instant deployment from CI/CD
- Single codebase
- Easy to source developers, even in-house
- No administrative burden from having to maintain accounts at Apple/Google.
Adding to home screen is important for non-technical end-users to recognize it as an "app" and not a "website".
This is essentially saying no-one can build a secure browser.
[1] On iOS.