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Notes -
I don't think that toy model captures important features of the situation - there are people with 4SD higher intelligence, and while it's not clear how much of that is caused by non-additive genetics / idiosyncratic or random environmental contingencies, you could just clone them. I'd expect the children of two people of 3-4SD intelligence to be more than 1SD above average, and an algorithm that just randomly generated a child of two random 4SD intelligence people seems pretty close to a linear extrapolation, intuitively, yet performs above 1 SD.
The intuition for why linear extrapolation might work better than you'd expect in a complex system is that new beneficial alleles have a strong pressure to combine linearly with other alleles to spread throughout a population that'll have many different alleles in its members.
The toy model definitely does not capture the entire situation. It's mainly intended as a warning that the tails come apart. I specifically expect that the linear extrapolation would break down if you tried to use it very far outside the naturally occurring distribution, and proposed a toy mechanism of that.
Yes, I'd expect that would work fine. In fact I'd expect that "clone a very high IQ individual" would work much better than "CRISPR up a baby from two average parents so that it has all of the SNPs that GWAS said were best".
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