Consequently, we cannot understand the history of science if we take a narrow (that is, modern) viewof its content, goals, and practitioners.5. Such a narrow view is sometimes called “Whiggism” (an interest only in historical developments thatlead directly to current scientific beliefs) and the implementation of modern definitions andevaluations on the past.

In a nutshell, then, there was never a time when humans uniformly lived in small, simple egalitarian hunter-gatherer societies, and a time when they started to switch to agriculture- thus inevitably switching to a  sedentary, hierarchical, and more complex life style. This is not because the correct trajectory is a different one, but because there was never a linear trajectory to begin with.