To emphasise this point: in almost all other animals, a profound level of motor specialisation is present at-birth. Most animals, are eg., born walking.

Whereas in humans, we are born needing to specialise almost everything during our lifetime -- which has incredibly high costs (ie., many years of being fed without being able to hunt) -- but high rewards: we learn how to conceptualise the world in novel ways, create tools, etc. both largely a product of our ability to specialise our sensory-motor system in response to the actual environment we're in.

There is no reason to suppose that we are analogous to fish in our personalities, but not in everything else -- indeed, there's obvious reasons to suppose the opposite.