Some people store less than others.

No evolved as individually

This is interesting. I would like to know where this idea came from. I would go further by saying that the collective mind is not even located in human brains but out there in the 'ether'. Rupert Sheldrake teaches that the individual's mind resides in morphic fields located on the super-natural plane. That would make collective consciousness the amalgamation of those fields. This is not to take away the processing power of the mind which he says draws our thoughts into the brain to real-ise them, something like a computer operating system drawing data into RAM to be worked on and then returned in its modified form to the morphic field. This harmonises in one way (processing) with Iain McGilchrist's teaching of how the left brain analyses data from the right brain, modifies the content and (ideally) returns the new data to the right brain.

Cite your research. I disagree with:

"As individuals we store very little detailed information about the world in our heads."

This is suggestive of the concept of universal consciousness. To what extent is evolution then driven by collective intelligence rather than the other way around? Could epigenetics be explained by collective intelligence?

It is a very interesting topic.

In fact, we need a balance between collective and individual. #interindependence #protectivitybeforeproductivity #terraprotectivityselfprotectivity [pnas.org] - "Collective human action is required to steer the Earth System away from a potential threshold and stabilize it in a habitable interglacial-like state. Such action entails stewardship of the entire Earth System—biosphere, climate, and societies—and could include decarbonization of the global economy, enhancement of biosphere carbon sinks, behavioral changes, technological innovations, new governance arrangements, and transformed social values." [pnas.org] [notre-planete.info] - According to Will Steffen, "To avoid this scenario [of supplementary warming ] requires a reorientation of the human actions from the exploitation towards the management of the terrestrial system".