Well since they don't explain the origins of Glamdring and Sting in the book so I guess they don't feel the same need to be consistent. Also Sting was intended as a dagger - it is only a sword for a hobbit.
I think the lovely curved blades are to fit in with the somewhat oriental style of costume and fighting given to the elves. I guess you could rationalise it by saying that elves preferred the two handed curved sword for fighting on foot but their knights also used straight swords? Maybe.......?
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“But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
Christopher Tolkien, Requiescat in pace
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