Granted, NYC is the biggest city in the US, so maybe that sort of reaction is more reasonable there than when people in Dallas or Boston do it.
Why does having launched in other cities matter if the new city brings up things that none of the other launched cities do?
For example the first thing I can think of new for New York is snow and ice.
It's my understanding that self-driving cars don't really account their acceleration and braking for roads that could sometimes be very slippery due to snow and ice.
Autonomous vehicles can and do take into account surface conditions, there’s not really any reason not to. There are pretty good generative models of the physics of vehicles with different surface conditions, and I imagine part of the data collection they are doing is to help build statistical of vehicle performance based on sensed conditions.