Earlier quoted context omitted.
Do you mean to say that being able to think in abstractions or keep a lot of state knowledge in short-term memory are skills that cannot be learned? So where did we acquire these skills, if not by learning?
Your calling them "skills" prejudices the answer. My best understanding is that they aren't skills, they are hardwired abilities. My best guess based on research that I've seen on IQ is that about half of the hardwiring is genetic and half is a result of childhood upbringing, but by adulthood they are not readily changed. That said, we build concrete skills around how to make the best use of those abilities. We build…
Or maybe they're just bad teachers.