To be fair most of the brain is more like a pretrained model — it isn't being trained at any point after conception to keep your blood pumping or your lungs working, it does that out of the box roughly as soon as you sprout those organs (or the minute you're born, in the case of lungs). The training process was billions of years of evolution. And, well, given fairly persistent cross-cultural cognitive biases, I expect the conscious thought parts are starting from a pretrained model, too, and all we're doing in school is finetuning ;)