Why Preserve a Broken Cornice Line?

There’s a lot that bothers me about preservation policy, but one of the weirdest has to be rules that make it difficult to fill in gaps in building height. I’m not a big fan of the idea that historic neighborhoods have to stay the same “scale” forever, but it boggles my mind that people can both support keeping neighborhoods “in scale,” but oppose people who want to bring a building up to the neighborhood’s scale.