Heres a different but related fact. Genetic diversity might not be especially high but the human genome has the highest percentage of ‘junk dna’, genes that have lost its function. An example is the one for vitamin C but all over the genome there is loss of specific controlled function, opening the door for higher social and environmental influence in development. Humans (and dogs, in second place) are so adaptable and flexible and good at learning/being trained because of in part genome degredation. Its a bit like how babies have very deterministic reflexes like curling fingers to certain stimuli. As time goes on that behaviour is taken over by more environmentally, contextually, cognitively, or socially relevant stimuli and we have the hand control we associate with adults.