[twofornone]

I strongly suspect that much of the messiness in empirical biological studies would be deconfounded if we were generally more willing to classify humans into narrower ethnic groups. For example, different groups of people are likely optimized for different diets, in which case insufficiently breaking down the ethnic makeup of your study cohort would lead to weak or contradictory evidence when applied to populations at large, as we tend to see. The same likely applies to various supplements, medications, and probably even psychological studies including behavioral and medical interventions for abnormal states.

I can understand the hesitancy to do so but I think most people, including scientists, are not aware of the likely cost. It is possibly to classify humans into races/subspecies without resorting to racial discrimination or animus - the same way we currently celebrate so called diversity.

I do believe it would likely have implications for the interventions which certain pockets of our society are attempting to install to correct for racially correlated inequities.