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I don't think precognition in Story Of Your Life/Arrival should be seen as a "power" - and certainly not one that Louise can choose to discard. The Heptapod perspective, which Louise gains, is "timeless": there is perfect symmetry between past and present, and therefore no free will (or if there is free will, then it must be a very strange kind of free will from our perspective, since one's choices affect the past just as they affect the future). Louise can no more change the future than you and I can change the past: it simply is.

    > now that I know
    > the future, I would never act contrary to that
    > future, including telling others what I know.
I think this should be read as "I could never act contrary to that future". She knows the future, unlike Paul Atreides who lives in a very different universe and knows only one of many possible futures. That her daughter will die in a climbing accident is as immutable as the fact that I was born where I was born. I struggle to even contemplate what it would mean for me make choices now that affect my past; it is the same for Louise with respect to the future.

The difference between the universe of Story Of Your Life and a generic deterministic universe is that in Story Of Your Life free will is not an illusion; it exists, but it can only be experienced from a certain perspective, which is complementary to the timeless perspective.

Very possibly there is a third perspective in this universe which is also equally valid. We could have a sequel (Departure?) where we meet the aliens do exactly what I struggle to imagine: they can observe only the future, and their choices affect only the past.

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