I agree with you on that point. The article was written, not with the intent of being a dissertation of 1,500 words or less about all the variables associated with how societies evolved, but rather a general overall view of how in a broad sense things evolved, grew from smaller, simpler systems into much more complex societies and the limitations of the human mind.

I do appreciate your points and agree with you there are many other pieces to the evolution of societies as a whole.