Going back to the OP...
Unlike others, I think the "accordion" motion is pretty intrinsic to MJ dancing - looking at an average social scene, it's almost impossible to see couples who don't use it quite a lot during a dance.
(OK, we could quibble about what "intrinsic" means, but if it's used that much, I'd call it intrinsic)
So, no, it shouldn't be banned, any more than turns and returns should be.
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