The work at these big tech companies (I've been with a few), gets divided in a way that is not readily noticeable to team members. I have seen companies arrange diverse groups in areas where management and visitors traffic, and then have other teams hidden away - usually on other floors. So, they're also physically separated from each other. While they have the same job titles, the work itself can be very different. They've promoted almost solely from that diversity group, so I'm not sure current management at these companies is even aware that it's setup this way. Likely, difficult problems get routed "somewhere" in the company, and solved as if by magic - then they get incorporated into the diversity teams projects.