As a pizza enthusiast who's lived in NY, Chicago, and multiple foreign countries, I have to disagree. I don't think it's the water like people say, though NYC's filtration system is completely unique, but you've got thousands of people all trying to perfect a similar style within a few square miles of each other, all within a city that has a very different culture and economy than any other in the US.

I think that that culture and competition alone lead folks to develop traditions and techniques that don't happen elsewhere, and I think it's also likely a commerce thing. NYC has the foot traffic to support dozens of shops making dozens of 24-inch pizzas, cooking them 65%, and then finishing them to order in a 700⁰ oven that stays preheated all day. Size of the pizza affects how the crust cooks, how they use the oven affects the even heating and final texture, along with a number of other tiny variables that only really make sense to do that way when running a counter service booth for 15 million people.

Much thin crust pizza is similar enough, but I think folks who taste no difference between NY style pizza in and outside the city are probably not putting their full palate into it, and are probably just hungry for/happy with anything with bread, tomato, and cheese. And hey, fair game.