I reckon accounting for generic variation in observational studies is more common then you are letting on, see mendelian randomisation. Also, in this type of re

I reckon accounting for generic variation in observational studies is more common then you are letting on, see mendelian randomisation. Also, in this type of research, race isn't the 'elephant in the room' that it seems you are implying, I mean it is already one of the most common stratifications used and disparities across racial lines in health outcomes are well recognised. The real barrier to a genetic understanding is with few exceptions, the affect of genes is really complicated.