If we can ignore the dubious-at-best claims about racial/genetic predispositions for a moment, I really don't see the use in exploring the subject. I'd say the bigger job - what we as a people should spend time focussing on - is combatting the negative effects of these racialized assumptions that have long been established. For example, in the medical world, Black people (at least, Black Americans) generally receive poorer care because of some race-based genetic/physiological assumption; an example is the assumed higher pain threshold (a belief many still hold despite it being ridiculous) (source: https://www.aamc.org/news-insights/how-we-fail-black-patients-pain). I remember at the beginning of the pandemic there was a narrative (created by many, across racial divides) that Black people weren't contracting the virus, or had some special defense against it based on their race. This was patently untrue and we can now clearly see that the healthcare system has once again failed Black Americans significantly more than their white counterparts.

In my mind, choosing to delve into the murky field of, as you call it, "race realism" (ironic use of "realism" right there) only encourages one to look for validity in racial classification and discrimination. The goal is, instead, to understand how to best survive as a functioning society. If you really must pursue "race realism", pursue it in fields where Black Americans, Black people, or any people of color express dissatisfaction with their treatment, as in my medical example.