I will agree it's limiting, but it isn't anywhere close to confusing. The one thing I will say is that some app settings are tucked away in the iOS settings app, which I would prefer them to be in the actual app.
Both are correct. You can hand an iPhone to a 3 year old and they'll figure it out. If you're used to Android and care about changing things or accessing files, iPhone is a pain in the butt.
There's always a learning curve going from one thing to another. Like you said, going from Android to iOS, learning the UI and where things are placed may take some time to get used to at first. I went from Android to an iPhone 12 a couple years ago, and it took some time to learn. Same goes for switching from iOS to Android. That being said, it doesn't mean the UI is confusing.