That still doesn't explain why the private party deck would have a better view. In fact, it would seem that if you're on the private party deck, unless you were able to be on the end, you would have the restaurant deck and patrons in the way of your view.
Also, can you still hear the music well all the way throughout the deck with speakers placed throughout?
Btw, I looked at the menu but it doesn't reference beverages, so I'm going to assume that, no, it does not, but if it does, probably very limited, which for us, doesn't matter since we don't drink or eat much anyway. We're already going to be well fed from all the other full service restaurants we booked, anyway. This will be our "farewell" dinner as it will be our last dinner there at WDW.