First: in most of the world the first 8 to 12 years are already focused on general knowledge with plenty of history, arts, culture, social studies, etc. Not job

First: in most of the world the first 8 to 12 years are already focused on general knowledge with plenty of history, arts, culture, social studies, etc. Not job training. Second: "civilization building", "maximally realizing human potential" and so on are occupations that very few individuals can have. Civilizations simply don't have the disposable resources to sustain a significant portion of their population focusing on such things.