I believe a wizard uses a staff simply because constructing a giant, wooden badger would be unfeasible and simply too bulky to lug about. And imagine the maintenance and upkeep!
Besides, from a literary standpoint, Gandalf saying, "Saruman, your giant, wooden badger is broken!" simply does not have the serious tone necessary for such a stirring moment in the book. Although as a special effects sequence, Saruman's giant, wooden badger collapsing to the ground in a great crash of shards and splinters might be impressive.
Ummm...have I mentioned that, once again, I have had far too much coffee to drink this morning?
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And your little sister's immaculate virginity wings away on the bony shoulders of a young horse named George who stole surreptitiously into her geography revision.
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