I think that Tolkien has a mental block on writing feminine character/personality. I mean Eowyn wasn't a very complex character either but she wsa so much better than Arwen.
Arwen just seemed to appear at the end all nice and convenient for Aragorn. You never find out what he likes about her or anything like such.
But Tolkien grew up in a male dominated society it would have been very difficult for him to have the insight that writers now have.
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lady Alakmundoiel of rivendell
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