because what can be embedded in billions of parameters is highly unintuitive to common sense and an active area of research. We do it because it works.

One other point, the platonic ideal of reasoning is not even an approximation for human reason. The idea that you take away emotion and you end up with Spock is a fantasy. All neuroscience and psychology research point to the necessary and strong coupling of actions/thoughts with emotions. you don't have a functional system with just logical deduction. At a very basic level it is not functional