[acdha]

This is like a rejected version of one of Heinlein’s omni-competent hero fantasies. Humans aren’t fruit flies, with anll individuals interchangeable and ready for life shortly after birth. Even ignoring the dubious math getting to those numbers, think about the skills and equipment. In your scenario, everyone’s so busy taking care of food and childcare that they’re not going to have time to realize that they don’t have teachers for all of the subjects or specialists who can maintain intricate manufacturing lines. The people who work on semiconductors can’t just switch to make pharmaceuticals or engines!