IIRC, Tolkien wanted to take the rock giants out of 2nd edition of the Hobbit, but he never got around to writing it.
Not entirely sure about it though.
I didn't get it either, but a big part of why I'm suddenly such a huge fan of the Tolkien world is his ability to 'create' it in such detail, but also the fact that there is a lot left to the imagination.
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