> Cognitive disparity is because of compounding investment of attention and metacognition in development [...]

Sure, but exclusively? There are no other factors that don't depend on effort / investment / social context?

I can't take you seriously when you take such an absolutist stance on these things when science has long since accepted nothing complex about humans is 100% nature or 100% nurture (really, shared vs. non-shared environment vs. genetics: but, surely you know this).