There is a thin line between disability and just different genetics. E.g. is it bad for a primate to have bad bite strength? What if that disability enhances t

There is a thin line between disability and just different genetics. E.g. is it bad for a primate to have bad bite strength? What if that disability enhances their thinking ability (by both allowing their brain to expand more since the muscles holding the jaw are weaker and by forcing them to use something other than their bite strength)?