Most mammals seem to have a built in social sense that enables them to sort into hierarchical groups based usually on agressiveness and size, but in some on intelligence and the ability to scheme and size up others' psychology. Of course the abilities involved vary within a species.
One of the ways in which humans are more efficient is in being omniverous and having no totally instinctive food preferences. People have to learn what to eat and this seeming liability has enabled us to exploit many more foods than other life forms, even to those needing elaborate preparation and now even to manufactured foodstuffs. Thus what seems a liability in the biological world, not automatically knowing what to eat, is a tremendous asset.
Humans to various degrees have to learn social behavior, though there's an instinctive core in most. People who are deficient in it are nerds or even autistic -- a few years ago they were considered "alienated" along with criminals, though criminals are actually highly social. Could autism or at least "nerdism" actually in the long run prove beneficial?
Consider how the innate social behavior skewed reason and held people back by causing them for tens or hundreds of thousands of years to think that storms were signs of some huge being's anger or that by pleading and bargaining with the sky or the river one could insure a good harvest. They weren't able to distinguish social interactions from the physical world. The ability to do so, meaning freedom from the grip of percieving the world through social instincts, would have and probably has in the long run resulted in deeper understanding of reality.
Thus persons who aren't automatically social may be at an advantage or confer on their group a survival advantage by having a superior outlook, though they have also likely often been killed for asking logical questions about a leader's pronouncements.
Possibly combined with extremely long lives during which people can learn social interactions by example and by logical thinking and by instruction whatever factors result in autism would be beneficial to humans. That seems unlikely, but the survival of a human infant compared to a baby deer also seems highly unlikely. With thirty years of childhood and another thirty or so as adolescents, people who live for centuries would benefit by being born almost totally asocial; though the social world would be entirely a construct (as leftists must insist by doctrine that it is) it would also be far more powerful and nuanced a tool than one partly inborn.
Just as people with scant food instincts but high intelligence have become able to exploit many more resources than chimpanzees, so such persons would build much more complex and beneficial societies.
Thus not only extreme intelligence and enormous life spans, but total alienation from others should be a goal of human improvement.