I think it's because of the definition of fantasy. In most cases to fit into the genre there are some characteristics, one of them being an older, wise guide often in the form of a wizard. This is common from Harry Potter's Dumbledore to Aragorn in LOTR, and takes the form of Obi-Wan in Star Wars. Also, there's always the sidekick in all fantasy stories (Sam, Ron, and Han Solo). The lovely thing about Tolkien's work though is that, despite all it's similiarities to the other movies/books, it was still the first, and set most of the guidelines to fantasy anyway!
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I sang of leaves, of leaves of gold, and leaves of gold there grew.
Of wind I sang, I wind there came, and in the branches blew...
-Galadriel
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