Well, one consideration to make is that the dancing in Part 1 was obviously meant to be awkward and unprofessional (Harry and Hermione are not dancers, they're dancing in the middle of the night in a tent, etc), whereas this is a high-end Broadway musical, so the standards are of course going to be different. Lol.
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I copare the dance scene in DH to this and I just think how is this the same person?