Does it really matter that much whether, in our minds, there is a single network ("service"), which handles both decision-making and self-understanding, or thes

Does it really matter that much whether, in our minds, there is a single network ("service"), which handles both decision-making and self-understanding, or these are two disparate networks that work in tandem? It actually reminds me of adversarial networks (like AlphaGo), you could also ask why there should be two networks that encode good game states, isn't it a waste? Maybe each network knows something that the other doesn't. Likewise, in our minds, maybe sometimes the decision-making network produces such crap that it needs to be tested first on a fictional model human, our own sense of self, before it can be vetted enough to be sensible to be actualized on the environment and other people.