The whole "prescribed roles" strategy makes more sense when the survival of the group is uncertain. Think of the most extreme example, those thought experiment things about starting the human race over with 15 people. I remember doing one of these in highschool. We had a list of 25 people and had to pick 15. In that case I was all for picking people mainly based on reproductive and survival factors.
reproductive strategy
The whole "prescribed roles" strategy makes more sense when the survival of the group is uncertain. Think of the most extreme example, those thought experiment things about starting the human race over with 15 people. I remember doing one of these in highschool. We had a list of 25 people and had to pick 15. In that case I was all for picking people mainly based on reproductive and survival factors.