Funny perspective, and we still wonder why democracy keeps getting usurped, dictatorship is in our nature! I am not sure neurotransmitters are the only chemicals, I was thinking of the whole plethora of enocrine substances such as hormones, along with neurotransmitters. I think that indeed you are right that the interests of the body and the brain are largely aligned, it’s only that the brain has so much control that its apparent stability is really amazing.
I was inspired by two things in this idea, the bi-cameral brain theory which is just an nice thought experiment and Daniel Wolpert’s idea that the brain is for motion. Especially that jellyfish which digests its brain once its fixed made me think of our brain lives this illusion of high autonomy.