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Just got off the Magic Saturday, so can answer your question.In a word, power. The ship was designed for specific loads. It may be that by changing the hair dryers over to more powerful units that they risk overloading a distribution panel. To have one of those trip as many people are getting ready for dinner and shows would be a mess.
The dryers that come in the cabins are the ones attached to the wall (ugh). I asked our Room Hostess for a better hairdryer and she brought me a Conair blow dryer to use during the cruise. MUCH better than those old style wall versions. Don't know why Disney hasn't switched over.