Jony Ive’s new “icon grid” is a guide meant to ensure that different apps’ icons look harmonious on the home screen. That’s a lofty goal. The issue of whether a grid can really accomplish that is complex; most designers think that non-block-based designs (so, not paragraphs of text, not photos, not headings) require a lot of “optical adjustment”. This is fancy talk for “tweak it so it looks right.”
But whether we accept the idea of a grid or not, here’s the bigger point: no icon designer I’ve asked thinks Ive’s grid is helpful. In that sense, it’s wrong. The large circle is too big. Many apps in iOS 7 use it: all the Store apps, Safari, Messages, Photos… In all these icons, the big shape in the center is simply too big. Every icon designer I’ve asked would instead draw something like the icon on the right. To our eyes—and we get paid to have good ones, we’re told—this is more correct.