That self-selection for living and organizing with kindred is something that also happens in the absence of extreme power disparity.

You've failed to provide evidence. All the examples we're discussing involve extreme power disparity.

That also doesn't necessarily mean that diversity = bad. It's easier to stay at home and watch Netflix than it is to travel to a foreign country and experience their culture, yet every time I do the latter, no matter how uncomfortable the trip can make me at times, I always come back grateful I did the trip, and imo a far better person.