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So why does the new Dune trailer reveal that Villeneuve has totally screwed the pooch? Jessica and Chani in the books (Dune, Children of Dune, and Dune Messiah) support the thematic weight of the story because of their loyalty to Paul, and they exercise a tremendous amount of agency and subtlety while negotiating the constraints that they have chosen for their lives (both chose to help put Paul in power, and both chose to be concubines when "wife" was politically impossible). Their character journeys already carry with them the implicit critique of power as a cage. Turning Chani into a conspirator in the assassination plot doesn't just undermine this, it actually breaks the world AND the themes, as Paul would have no choice in such a situation but to kill her because Paul is also imprisoned by his power. Villeneuve, in his attempt to bring the books' critique of power to the foreground, has completely undermined the world he's spent hundreds of millions of dollars and nearly a decade constructing. It's foolish, wasteful, and a very good example of a creator failing to understand the material he's working with on a very fundamental level. It's also worth noting that in Herbert's universe, women are NOT the moral guardians. They are just as corrupt and corruptible as the men (and far more powerful than all of the men excepting sometimes Paul and always Leto II).