As a former Googler, Google has been utterly hostile to self critcism on this front. Responses to any criticism of Google's UI falls in the following buckets:
- Well I think it looks great.
- Stay in your lane, how dare you criticize our designers. This makes them feel unsafe at work. (Whatever the fuck that means)
- We did a user study and they liked it, so it must be good.
Fundamentally, Googlers are afraid to make real judgement calls. You're accountable to those. So you hide behind endless user studies, committees, etc. This doesn't just apply to designers: Engineers are also sandbagged with "we need more data" until a risk-taking idea gets snuffed out of existence.
The internal "inspirations" doc for Material cite the original Google.com search UI. A big white screen with a text box in the middle.
If you ever wonder "why the fuck can't I tell where one piece of the UI ends and the other begins" or "why do I have terrible eye strain from this UI" when looking at a Google property, it's because designers are boxed in by that "inspiration."