If I gave you 15 seconds you could come up with a pat evolutionary just-so story to account for this, speculating on what reproductive advantage it serves.
Something immaterial can’t have an effect on the material realm, presumably, so how would it be selected as advantageous by Darwinian natural selection?
“The brain is not billions of little computers. It vastly exceeds the most powerful computers in efficiency but it is not directed to calculation as such.”
“We have already genetically engineered babies, the march toward three- (or more) parent human embryos, and radical proposals for creating novel family forms.”
“There are no intellectual seizures, which is odd, given that large regions of the brain are presumed by neuroscientists to serve intellectual thought.”