The thing is, we’ve grown up. We don’t require hand-holding to tell us what to click or tap. Interactivity is a matter of invitation, and physical cues are only one specific type. iOS 7 is an iOS for a more mature consumer, who understands that digital surfaces are interactive, and who doesn’t want anything getting in the way of their content.
This sums up iOS evolution quite well. I've been using iOS 7 on my new iPod Touch (which I bought especially to test the new iOS) for the past 2 days and I'm in love with the new user interface. Finally, UIPickerView won't look out of place if I use it in my apps along with the other custom UI elements.
Apple introduced a lot of great features and APIs in iOS 7, but I'm especially excited about the Inter-app Audio technology.