I think it's a bit of a stretch to say that Chibnall hasn't watched the Missy episodes. As a fan, I would've liked to see some acknowledgement of Missy's arc and an explanation for how (s)he survived a supposedly final death. But at the same time, I understand that Chibnall has to keep casual viewers in mind and do his best not to alienate them. Plus there's nothing stopping him from writing an explanation into a future script if he wants to.

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