As an addendum: First, suppose you compare a group of random people from the same demographic to a random groups of people from different demographics. Next suppose you compare a group of random lawyers to a group of random laywers of different demogaphics. I would suggest that in the second case the increase in diversity from adding demographic diversity would be significantly reduced as the bar to becoming a lawyer would filter out a lot of diversity of experiences from the first case. For example, a greater proportion of African Americans experience poverty than the general population, but the difference among those who become laywers would be much less.
As an addendum: First, suppose you compare a group of random people from the same demographic to a random groups of people from different demographics. Next suppose you compare a group of random lawyers to a group of random laywers of different demogaphics. I would suggest that in the second case the increase in diversity from adding demographic diversity would be significantly reduced as the bar to becoming a lawyer would filter out a lot of diversity of experiences from the first case. For example, a greater proportion of African Americans experience poverty than the general population, but the difference among those who become laywers would be much less.