NeGver count on getting a fireworks view at a dining venue. EVER. You have a 9:15 ressie? You may not even be seated on time. What's guaranteed is that whoever is at that window seat or whatever, isn't leaving the table until AFTER the fireworks. So you'd more than likely be placed somewhere else.
This is a big pet peeve of people and Illuminations fireworks. Lots think they can get a 9pm ressie and get to see the fireworks.
As the other poster said here... it's kinda a choice... you either want to eat, or you want to see the fireworks.