Since the contest spectaculars are pretty much the coolest looking and appealing move, the move would change. But, in this case, the reason it's questioned about it's effectiveness on when it was used is because of his secondary effects. It only works if you're after a pokemon whose made their appealing move. If you start off with it, nothing happens, whereas if your like finishing it off, it will include its effects.
Basically, not much from it's original appeal. Hope this makes somewhat sense!