"better visual sense" This example pertains to mean skill level which doesn't seem relevant to the variability hypothesis (which pertains instead to variance o

"better visual sense" This example pertains to mean skill level which doesn't seem relevant to the variability hypothesis (which pertains instead to variance of traits/skills/interests). If your point is that the empirical findings underpinning the variability hypothesis may have some cultural causes instead of being only genetic, then we don't disagree. But I wouldn't agree that the culture-over-genes perspective is undersubscribed, that's the most fashionable and socially acceptable perspective to take.