Ping.
According to natural selection,such a broad and diverse gene pool makes for healthier and smarter offspring even if the young are not raised around city-state scholars.
Brilliant if unschooled people were thus common among the nomadic tribes—sometimes—like Genghis Khan—they applied their gifts unfortunately.
I read one time that the word Scotch comes from the word Scyth. Don’t know if that is true, but if it is, it explains a few things.