That is true. Dual residency gives you much more options. I just figured that without a FL drivers license or any real official proof that you live there. Most shops won't buy your story of dual residency.
Just looking at it from a practical point of view.
Especially with all the stories of Bloomberg sending his people to other states to make trouble for gun dealers. I imagine most of them would be very wary of dealing with NY'ers under such "questionable" circumstances.