Probably another reason Arwen took Glorfindel's place at the ford was to cut down on the confusion. The more small characters you have, the more confusing. It was hard enough to put what they did into 3 hours! More small characters would mean more for people to keep up with, and for those who haven't read the books, that would be more confusion.
Arwen
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Will Turner: "This is either madness or brilliance."
Jack Sparrow: "It's remarkable how often those two traits coincide." ~ Pirates of the Caribbean
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