Animal domestication is really wild. So we first select for neoteny (playfulness, dependency on caregiver, physical features people like) basically prolonging the juvenile state. Then we put them in controlled environments of abundance, were all their needs are met. Which further diminishes need to reach adult state (with traits like aggressiveness to compete for resources). This abundance causes them to mature/breed…
Recently I had an interesting thought that basically people did almost the same to themselves spontaneously through culture. Which might influence various aspects of human behavior, like social interactions in general, cooperation and means of competition, mate selection. We might have genetic changes that are not maladaptive only in the culture that introduced them. As technology forces culture to evolve it might tu…
But there's no such thing as an objective "evolutionary fitness". It only makes sense to speak of evolutionary fitness in a given niche.