This runs right into the problem that Harvard ran into when they first switched away from exclusively tests - Goodhart's law applied by HBD Tests are a proxy for overall genetic quality as long as the context is humans who resulted from the same selective pressures
It was an ex of something that would work pretty well in a mono-ethnic state but breaks quite badly when you introduce human biodiversity. Reaction time was also considered indirectly - that's what athletic scholarships were about. Another, different group broke that correlation