Interesting to see someone else's perspective. I felt the opposite, the designers won out to the detriment of the UX in several parts of the redesign.
The buttons, for example, seem completely arbitrarily placed and inconsistent. Check out the difference between compose or replying to an email. Or creating a calendar entry or the full page editing calendar screen (and the two are the 'opposite' way round, it's totally fubar). It seems to be according to some sort of an attempt at 'page balance' that got abandoned in more complex elements to my admittedly untrained eye.
A red button seems to be intended to be the primary action on a page but again each part of the system is totally erratic on whether this convention is followed or not. Add a calendar event? No. Edit a calendar event? Yes. Reply to an email? No. Compose a new email? Yes.
Why do three little dots appear next to the check boxes when you hover over an email? How does that help at all? It just seems to distract my eye and doesn't actually help me distinguish whether I'm about to check the right email at all, the usual reason for hover styles. It's just pointlessly pretty that's turned into distracting.
The more I use it, the more confused I am exactly how the hell it got signed off. Bizarre.