Some of the bad phone UX ideas started on iPhone. Like removing the physical button at the bottom in favor of annoying gestures and no touch ID. And iOS 7 removed all of the borders everywhere, it’s arguably more radical than Google Material, a UI design I also am not really that fond of.
I guess if you mean there’s no A/B testing or it moves slower then probably. But, it definitely moves. That becomes apparent any time you load an app from the App Store that hasn’t been updated in a while and suddenly your phone looks and feels like it did 2 years ago across the whole UI.