Final answer:
The narrator objects to hunter-gatherer life due to its precarious nature and lack of opportunities for advancement. They argue against viewing contemporary gathering-hunting societies as reflective of humanity's evolutionary ancestors.
Step-by-step explanation:
The root of the narrator's objection to hunter-gatherer life lies in the precariousness of the lifestyle. Hunter-gatherers relied on the natural resources available in their environment for sustenance, but there was never a significant surplus of food to support population growth. This led to a static population and limited opportunities for advancement. Additionally, the narrator argues that contemporary gathering-hunting societies cannot be seen as representatives of humanity's evolutionary ancestors as they have been influenced and shaped by interactions with farming and herding groups.