I've had an iPhone since 2009 and feel they have gotten much more confusing over time.

It seems to be there has been some sort of internal conflict between the need to add basic functionality to be remotely comparable with Android, and the desire to keep everything "simple". The end result being a kind of a worst case of neither being especially featureful nor all that simple. There's a cottage industry of apps that exploit users' lack of understanding of their own device's capabilities (e.g. flashlight apps with ads + in-app purchases).