It doesn't follow Apple UI guidelines. In 1984 we learned that having one, single, mouse-driven UI paradigm for all programs, handed down to us by our superiors in Cupertino, was an objectively superior mode of interaction with a computer, saving many lives' worth of time and brainpower over the years. Yet somehow, Stallman remains so empathy-deprived as to be stubbornly unenlightened by this knowledge.