[001sky]

I don't think your last sentence is a at all true.

all cultural, mutable, consensus based concepts are more easily learned as a child

There are many "hobbies" that have a cultural component. It helps to learn these earlier, because it removes cognitive overhead during later studies. But its simply not true that children are better at learning everything. They are hard-wired for language tho. Plenty of other things they are un/der developed for.