The point of having a director is that they make the final decision; it's their point of view, they set the rhythm and they make the final decisions.
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There are movies that require fantasy and slightly more fantastical acting. Lines that are good for certain movies, in real life circumstances, would be absolutely unbelievable things to really say, and you would look at these people like they're freaks for conversing that way. But somehow for certain styles of movies, it works, and it seems fine.