As these “just so” stories explain how something grew or developed over multiple generations, we should keep in mind something that isn’t stated: for this to ha

As these “just so” stories explain how something grew or developed over multiple generations, we should keep in mind something that isn’t stated: for this to happen, tons of humans were apparently dying of hunger, unable to get enough to eat, before they passed on their genes. Either that or the humans with larger brains were able to survive better and have more children for other reasons. But then the reductionist theory is wrong. Hmm which is more likely?