Sorry to better phrase my question: to level out the social disparity over time by admitting some URMs to top research institutions like Harvard, Yale, etc .., who may be less qualified, no doubt sacrifices the quality of specialized patient care. I am sure patients with specific needs in upper continuum of care would not like that. Thus, I ask is there another reason.
There isn't favoritism in the sense that you are a URM, but being from havard might help your case. There is a range of scores/activities that are taken account for all residencies.. so while you might have been less qualified upon entering Havard, but you might have published more research or participated in community service...or use your personable skills to get great LORS... or who knows, get a 240+ on the USMLE...
you might be interested in this: http://www.nrmp.org/data/chartingoutcomes2009v3.pdf
OP, I think I focused on the bold more so than the rest of your above statement. You probably should try to ask a specific question.
I still stand by my basic argument. If you are a URM accepted into a more specialized residency, you will continue to provide patient with good quality of care (maybe even better since you are so focused on one topic and will know everything about it... compared to generalized care)