Ratatouille does not like arbitrary prohibitions, such as sexist rules preventing women from occupations they are suited for. It makes this point, however, by means of discussing identity and the inner voice, and in doing so it makes essence look arbitrary. It is worth asking whether this way of making the point is fair.
How could there be a morality that lies outside of my inner voice, and how would it relate to my identity? An answer to this question comes from the movie Toy Story, by recognizing that my essence determines both who I am and what I should do.