I've read many of the replies on this thread and I see the word or sentiment "professional" pop up a lot.
I think we've come to see "complex" (as exemplified by the use of lots of "chrome" and skeuomorphic elements, faux reflections, gradients, and so forth) as a sign of "finished" or "professional" design. Many of us have become so accustomed to it, that when we don't see it, we assume something's missing. And that WAS the "old school" of design pre-2012.
I think what Ive and Co. are saying (as WP8 and to a certain extent, Android, are as well) is that a minimalist UI that simply presents the user options in a less-adorned way is what the consumer wants. From a design standpoint, I think he's right, and it has nothing to being professional. It's been part of Apple's overall product industrial design for over a decade now. Finally the UI is catching up.
When the design ceases to be the focal point, you can be more productive with the device or interface. I think that's what we have here: a stripping down of the UI to base elements and simplification of what the user can expect to see with the hope that less focus on the "look" will enhance the "feel."