Unpopular opinion time:
I don't get how so-often the pro-URM argument is URM=SES. I get that SES is a real disadvantage. Your parents are undereducated, your peer group pressures you to remain in low-SES, you're under-informed and under-resourced to succeed or to even know how to succeed in medicine or higher ed.
The problem is that URM does not necessarily imply low SES, just as white or ORM does not necessarily imply high SES. In fact, it is, by definition, racist to assume so. You can argue the correlation may generally hold, by statistical average, but you cannot assume it is a rule.
In fact, the real problem is that these research programs---and admissions faculty---often forget that SES is the biggest measure of disadvantage, not racial status. It is an injustice when these programs only care about race. It completely screws over low-SES whites and ORMs. It assumes all whites or Asians are high SES so they don't need to worry about white people or Asians. Or it assumes they're just smart enough to pull themselves up by their bootstraps---again, a racist thought, implying that the URMs inherently lack the intellectual or behavioral capacity to do so. Why is it social justice to give a boost to a rich URM over a poor ORM? I thought America is supposed to be the land of opportunity, not the land of quota-filling. Mindless discrimination purely on the basis of skin color only strengthens our perception of race and takes us farther from a color-blind cultural consciousness.
If a program requires its URMs to also be low-SES, I am all for that. Otherwise, it's just a system that says their evaluation of applicants is merely skin-deep.