How many Black parents have the resources it takes to get their kid to be a physician?
These high skilled jobs require a lot of resources and networking. It is much easier if your parents were professional in that field.
Many of our kids will be the second or first generation in their family going to college. That's a very difficult jump to go from a poor/working class family to preparing for graduate school and a professional career. Then consider you have to compete against kids who are second, third or fourth generation in that field.
Weak argument