You are overlooking the serendipitous positive use of what otherwise would be negative traits, which is pretty much the origin of complex traits. In other words

You are overlooking the serendipitous positive use of what otherwise would be negative traits, which is pretty much the origin of complex traits. In other words, that babies got to grow without much hardwired control of their own bodies (and that includes thoughts) provided the opportunity for humans to grow into distinct behavioral patterns (i.e. exercise creativity), and to free themselves from what the genes predispose and then be open for what the culture demands and imprints. Think about it: the ability to learn so much and about such breadth of subjects could, perhaps, have been made possible by the early birth imposed by pelvic changes related to upright walking. Chimpanzee babies only get one month of flexible, learn-it-all minds.