[tracker1]

I know that some of the details above are worth calling out. In terms of usability, it's important and that is as much an implementation detail as it is a design guideline detail.

Regarding the buttons, I agree they should elevate on hover and press down... with the animation for the click radial effect. Touch interfaces with just the radial click indication.

For the survey/study, I'm not convinced this is a bad thing. Actually interviewing with people to determine what works best should be actively encouraged.

This also isn't to say that I think google proper really cares all that much. I'm pretty sure their UX designers are treated like second class citizens in their engineer focused culture, let alone those that cross between UI/UX and engineering.

I also want to differentiate between "Material Design" the guidelines and "Material UI" the react component library. It's probably the single best component library I've ever worked with, which isn't saying too much as it's not perfect, just better than anything else I've seen.

edit: the main point was that Google's blessed implementation for their UI design framework is less used than a third party implementation for another framework.