I think that typically our ancestors were skilled at many more things than we are. There were no stores to buy things.
Today we each ‘specialize’ to survive. We do our ‘job’ well to get money. Does that mean our ancestors were less intelligent? How many of us know how to make aspirin? How many don’t know what poison ivy looks like ?
Sometimes I think that our ancestors were smarter than us, and that previous unremembered civilizations were much more advanced (or made advanced use of the ‘environment’ at the time).
Modern brains are smaller.
“How many of us know how to make aspirin? “
Willow bark tea.