I thinks this guy is missing the point. Google did uix research and come up with a more usable design philosophy, which makes all apps more consistent. They are now executing those grand-design rules. In the end, apps should be more familiar, and easier to use. The change itself is always frustrating, people who are used to an uix (by learning it), hate change, even if the new uix is simpler.
That's all well and good, but they seem to do this every two years or so.