That's assuming an internal company culture couldn't be created based on shared understanding that would lead to competitive advantage. Eg, if you create a company with only black women, you may not necessarily get the very best individuals, but you could create a very unique culture. That culture could empower the whole team to work better with each other with the end result being a more productive team even though individuals may be less productive alone. It could also reduce turnover and increase job satisfaction, leading to less time spent training and cheaper and more productive overtime for the company.

Such a company could be at an advantage in a free market where there were no rules on employment discrimination.