Don't forget NYC has 5 Boro's. Manhattan is what most people think of when NYC is mentioned. The other Boro's have millions of people with plenty of single and one&two family dwellings. Here they are now permitted to use NM cable.
The funny part is most of the electricians in these areas cannot even think of NM cable. It is kind of funny.
I did see some house in Brooklyn last weekend that were being wired with NM cable though - so some are using it.
