It talks about expectations placed on gifted children and what that 'might' do, but failure for anyone else can be terrible too.
I'm just not sure when you get to the outcomes being gifted or intellectual or whatever term they want to use, is all that different from anyone else.
I've always been a believer in the idea that belief in a higher power was the genetic mutation that allowed humans to gain significant higher intelligence than other animals, as well as language, while still functioning productively and altruistically. People with significantly higher levels of intelligence are much less likely to believe in a higher power.
I also speculate that this is why there tends to also be a hard upper bounds of intelligence and why we have such a significant amount of people in the middle of the bell curve with very similar levels of intelligence.
This is true by definition for any randomly-generated trait which can be measured on a single dimension.
We evolved until we outcompeted our relatives (its why we are the only homo left) and until we were the apex species of our biosphere. After that the pressures were much more diffuse over the nebulous optimization space of "what makes humans have more babies".
It should be completely unsurprising that our brains are functionally only as smart as they need to be to be able to handle complex language, social interaction, planning, and spatial / self awareness. With some slight bias upwards over the millennia - probably moreso from more caloric availability, in the same way we have gotten markedly taller in 300 years mostly from just being food rich and nutrition aware, than from genetic drift from natural selection.
To evolve substantially larger brains past what we already had would have been evolutionarily contrary to fitness. Bigger brains require more calories, moreso endanger the mothers in child birth (and our births are already extremely dangerous due to just that), required more developmental time to mature (15-25 years is insane in terms of developmental maturity in nature) and would have had minimal or no competitive advantage (complex reasoning skills aren't really valuable when all you are born into or will ever have is a tiny tribe and the tactic of exhausting gazelle all day for dinner).
Going back to the second question of mine, is it feasible to see a divergence on the genetic basis over time amongst humans, in that the top academics tend to marry amongst themselves, and we have the strongest meritocratic system available that has been ever known to man? Looking at the Nobel Sperm Bank, there is some evidence of such a divergence already in place.
Answer: it isn't . It's been steadily increasing (and pretty rapidly, at a couple points per generation).