Mariah has legendary attributes, but she doesn't present herself as one. And no, she doesn't have to be this classy whimsical and boring woman wearing old woman clothes. 
I used to wonder why people don't really consider her a legend, but the answer is clear. People will only put you at the pedestal that you put yourself on. 
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The nodules thing is a valid excuse, but it's irrelevant to the EXCESSIVE amount of lipsyncing she does. 
If she can sing well in at a live show, what's the difference in a 3 minute TV performance 
 
 
 If anything, she has to muster up less energy for the awards show performance than a full 2 hour concert. The latter is clearly more detrimental to her voice 
