Basically, the filmmakers didn't think it was worth it to introduce a minor character who is afterwards never heard from again, when they could instead enhance the character of Arwen and strengthen Aragorn's story arc. I would have loved to see Glorfindel, but I agree with the decision.
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"If you're referring to the incident with the dragon, I was barely involved. All I did was give your uncle a little nudge out of the door."
THE HOBBIT - IT'S COMING
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