>phones are feature complete

This is a much better explanation to slowing iPhone sales than people complaining about the missing head phone jack, the lack of TouchID, the notch or sizes. I don't think any of those design decisions have made any significant number of users pick Android phones when upgrading.

For most of us, there's simply no reason to upgrade from the iPhone 6 or 7, they're absolutely fine, and I'm not sure that the improvement in the camera quality is something that many will notice.

I'm not sure if this is the case in the US, but most carriers here don't have a 2 year upgrade plan, you don't get "free" phones anymore. You can get a payment plan, where you pay of your phone over two or three years, but they aren't getting you a new one, not even at a reduced price.

The problem also affects the software, I am getting the feeling that new OS Frameworks are being added, just because, like all the ML craziness.

Instead of focusing on what really matters in terms of developer productivity.