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ChrisHallquist comments on The Statistician's Fallacy - Less Wrong
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Yes, I read that. The issue is that all the factors we've been able to test for turn out to be correlated. If those 2766 independent abilities actually exist, we've been totally unable to find them.
(I don't know when you posted this comment, but shortly after making this post I tried to edit it to make this point clearer.)
Edit: I should add that Robin Hanson's comments on this issue seem plausible:
Still, I think it's clear that something important is going on with IQ.
I would be equally surprised if there were no individual nervous system differences both general and modular in metabolism, architecture and size since all of those are genetically controlled and different configurations impose different costs and benefits. Why would the brain be any different than other organs in this sense?
Training probably also has both general and modular benefits, and it could begin as early as in the womb.
Consider also that since the brain seems to lack a proper software-hardware distinction, you might not even be able to distinguish some parts of iq and training simply by looking at the brain.