Apple definitely removed as many affordances as possible with each screen, almost to the extreme. Now, have I figured out how each screen works? Yes. Do I think the UI would be improved with a few more visual hints (button backgrounds, consistent color choice for actions)? Yes.

iOS 7 is such a large reset from previous iOS versions, and I would expect to see this new design language evolve over future releases. The best comparison I read: think of the changes between OS9 and OSX.