Your definition of humanity is more the definition of civilization, which came after the domestication of wheat, which is a thing I've actually studied a lot. The problem is that that definition has nothing to do with a physical change in humans, it's just a societal shift. Humans have existed for like 315,000 years and those people, other than different advancements in technology were the same, doing what came naturally to them. We're social animals and living in societies is as old as humanity itself.

Capitalism was a system so alien to humans before the hording of wealth that it took a solid millennium for them to get used to it. People just exchanged goods and services for thousands of years, or sharing tasks and pitching in to help each other. The majority of human existence resembled anarchy or communism more than capitalism.

Humans just don't naturally use money or enact capitalism unless the need exists, which usually doesn't arise without the complication of advancements of society.