It adds more opportunity to develop Éowyn's character by playing first to her dismay that he did not return, then to her joy when he arrives later.
And what's the point of developing a character that is so minor to the story when you could have put a lot more stuff that would make better use of that time.
Yes, it does. It makes Merry and Pippin into something more than spectators, which is what they would be for the whole movie otherwise.
And so? They were basically spectators in the books.
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