This is very actively studied, and the idea that it's somehow suppressed in the academy is another pervasive Internet myth --- put it on the shelf alongside "every employer would use IQ tests to hire but they're illegal" (they most certainly are not).

I think what some people are noticing is that there aren't splashy results to confirm, like, The Bell Curve. Yeah, that's because The Bell Curve was really dumb; it's from the phlogiston era of this science.