It isn't necessary because the idea behind the cartogram is to make all districts visible, since they're all the same size. That said, NY illustrates the tradeoff the cartogram requires us to make, since the NYC districts all appear to be "upstate"! (This is why we also produce traditional maps.)
Is the NYC pull-out missing in the cartogram (I see it in the “traditional” version)
It isn't necessary because the idea behind the cartogram is to make all districts visible, since they're all the same size. That said, NY illustrates the tradeoff the cartogram requires us to make, since the NYC districts all appear to be "upstate"! (This is why we also produce traditional maps.)