One explanation is that if the range was too big the archers would probably not hit anything. As is said by Gimli in the movie the Uruks had good armour, so it would make sense for Aragorn to want them to wait and shoot only when the Orcs are closer. Not enough arrows could also be a reason...however all in all it does make pretty little sense to me that he made them wait
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“The invisible and the non-existent look very much alike.”
Delos B. McKown
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