Well this is dumb:
Google is a $170 billion company. It employs thousands of engineers and developers. It tests, tests, tests, and tests more. In fact, its “designers” once unable to pick a shade of blue tested 41 variations of it. It’s ludicrous to think that the Buzz fiasco was simply a result of under-testing.
Yes, Google tests lots of minor details with lots of user data. How do they get this data? From actual users. How do they get actual users? By releasing products. So it seems totally reasonable to imagine them releasing something without heavily testing it; their whole culture is based around testing things in the wild.