Simulating physics from first principles is not "mimicking human behavior." Don't dismissively phrase it like a chatbot. If you insist the exact molecular exchanges in human neurons are a mandatory component, you could observe every subatomic event, not just the fact they talk to you like any other meatbag on the street.
I never insisted that it’s “only simulating consciousness.”
You just did! Again! You think an entire simulated human being, that acts exactly like a living person for the same underlying reasons, must be different - somehow. Your consciousness only arises from the laws of physics and the shape of matter, but if we simulated both of those exactly, and got indistinguishable results, then nuh-uh.
This is dualism. This is Descartes torturing dogs and insisting they only act like they feel pain, unlike us real humans, because we're different and special. It's straight-up Chinese Room horseshit, where no demonstrable evidence of conscious thought is enough, unless it fits your preconceived notions of what minds look like.