I don't know any advanced features but I can use all apps just fine. Pinch-to-zoom and a few swipe types are sufficient for most use cases.
Edit: why the downvotes? I didn't say anything controversial. If you disagree, write a reply.
I love reading quotes like that that are backed with, you guessed it, absolutely nothing.
Pinch to zoom is a great example. It may not be your first guess but it's the type of thing that you do a couple times then look back thinking, Wow! that's a great way of representing zoom on a device capable of listening to multiple inputs at a time. And subsequently will never forget how to do it, and it becomes your first tool when you want to zoom.
Anyway, I agree with you. (There are two of us!) Apple's stuff is built to be easy enough for a know-nothing user to get the basics done, and depending on your skill, you gain access to more and more over time.