Nobody knows (full scope and on every level) how human brains work. Still bosses rely on their employees' brains all the time.
AI sits at a weird place where it can't be analyzed as software, and it can't be managed as a person.
My current mental model is that AGI can only be achieved when a machine experiences pleasure, pain, and "bodily functions". Otherwise there's no way to manage it.
That is what the parent meant.