While NYC was spared the worst, eastern L.I.; eastern CT; Rhode Island, and eastern MA, received 1.5 to 3 feet.
30 mile shift to the west and Manhattan would be sitting under at least two feet.
Try this experiment: Draw a three foot by three foot square at the bottom of the Empire State Building. Then go to the 86th floor observation deck and drop a golf ball and try to put it in that square.
That is about the level of difficulty in predicting exactly where a particular storm is going to drop it's snow.
Then they should not be 30 miles off.