Ignoring the aesthetics, they’re breaking basic workflows. For instance, try rejecting a calendar invite with a response. I guarantee you’ll screw it up the first time.
Something similar happened with windows phone. Version 8’s UI was painstakingly optimized to minimize the number of taps to get anything done, and all the controls were at the bottom of the screen. (I guess market research showed that people use fingers to control their smartphones, and not some other appendage.)
In 8.1, they increased the number of taps for most interactions. For instance, in 8.0, you opened maps, typed your destination and pressed enter. It popped up an interstital screen with options that timed out after 5ish seconds of no interaction, and then started navigating.
This was infuriating, but still well beyond the current state of the art.
If I remember right, in 8.1, you had to wait for networking, click through the screen, wait again, and click OK, just like on current iOS (except that the controls on iOS can’t be used one handed, so you get to have zero hands on the wheel instead of one). Also, even in the broken revamp, it was obvious what was tappable, and what was not.
Google has taken regression of basic workflows to a new level with their new ui revamp.
For instance: Clicking “no” in a calendar invite brings you to a confusing form with no useful information and a bajillion user interface elements. You need to click a low contrast text box that says “invite guests / tldr” to type a repsonse, and then click a button. Of course, there is no visual indication that the “invite guests...” text is an editable text box until you click it.
Typing your response and clicking no doesn’t actually do anything until you click the red button in the top left of the screen. The only way I’ve found to discover this is to attempt to close the calendar UI.
I have never attempted to use the new calendar UI workflow on a phone. I suspect it is even worse.
The fact that Google is dysfunctional enough to ship things like this boggles the mind.
Even Apple, which is supposed to be good at this stuff, is years behind defunct competitors in easily quantifiable, obvious metrics.