Are there any theories or schools of thought that assume most humans still act as if they are still hunters/gatherers?
Hunter/gatherer societies of today would still prefer to sit around and talk with their friends than to learn about sci., eng., or even social sci.
I went to a place in a remote part of the Sepik where I was the first traveller to reach as well as a similar area in the highlands. The children had never seen a white person.
People in both areas have ample leisure time and it seems to be center around sitting in a circle and socializing. They spend more time with friends in a day than most westerners spend in a week.
A guy asked me how could he get the things that I have. I told him, "Do this, do that, don't do that, blah, blah....even then I don't think you'll be able to achieve it but possibly your children. However, it will mean that you can't sit around the fire all day and do nothing." He replied, "Then I don't want it. I like time with my friends around the fire. I'll keep what we have."
This does not sound too different than modern citizens. There is little interest outside of sports, idle chit chat, gossip, and celebrity news. Most people also want to be trained, rather than be educated. Conversations and social interaction are the only desired means of learning for most people. Learning a set of rules vs creativity/exploration.
It would explain why Alan Kay believes all scientists/engineers constitute less than 1% of the population. The rest either want training or manual labour (ie the same mentality in surviving in the wilderness.)