It’s less egregious in other contexts and other industries, but I still haven’t ever seen e.g a college whiter than the state it’s located in. I’m sympathetic to affirmative action as a solution to break up a true monoculture, and I’m sure there’s some institution somewhere that would be 100.0% white if not for their valiant efforts to fight it. But I don’t see any indication this is a common problem.