Medical sector has one responsibility: take care of the patients.
Doctors that share a racial and cultural with their patients are able to provide better care. It's been seen in multiple studies that elder African American women are more likely to follow the advice of the doctor if the doctor shared their background. There is little controversy around the fact that diversity leads to improved health outcomes ( https://pubmed.ncbi.nlm.nih.gov/8675280/ / https://www.nber.org/system/files/working_papers/w24787/w247... )
Similar trends can be seen in other fields. So affirmative action is not just good because it is the morally right thing to do, but also because it is the more practical solution quite often.
I don't mean to suggest that (also as it turns out there's just a frightful scarcity of doctor candidates willing to work in rural America to begin with so that's a moot point to argue any which way).
I sought to note the particular and unique plight of African Americans. I came upon this picture of Ruby Bridges a month ago: https://i.imgur.com/SSRsywY.png and I got to reading what became of her, and I found this recent picture of her: https://upload.wikimedia.org/wikipedia/commons/7/7c/Ruby_Bri... that's that little girl who put up with a lot of shit just to attend the same school as white girls -- and she doesn't even look that old in this recent pic! The idea that we don't have to do anything to make up for denying the black man and woman the right to drink from the same fountain as the white man and woman, to attend the same school only a few decades ago is deeply unsettling, as the auspices of privilege reverberate down the generations, so do the weighted anchors of un-privilege.
In that vein, I think the argument you seem to be converging toward is not very strong because we have a special select of Asians and Hispanics, they are a special bunch to have taken the initiative to leave everything behind and immigrate elsewhere for a better life, likely they were moneyed enough to make the move, likely they had a strong social support networks as indeed Hispanic&Asian households do, better eating habits, probably more active, etc.
Also, people of similar backgrounds are more likely to understand the environmental health problems. For example, doctors from middle-class backgrounds don't understand as well the stress and trauma of poverty, and associated malnutrition. White doctors generally don't understand as well the stress and trauma of living with racism daily.
