With a hatchback it’s all about the hole, and Subaru widened the Impreza’s. The outgoing hatchback had large singular taillight clusters that, although big and bright, pinched the opening due to their size. So Subaru has split the taillights, putting part of the lens on the liftgate (as so many crossover designers have done before Subaru), thereby adding four inches of width to the narrowest portion of that fifth aperture. The result may look slightly generic, but it makes for easier access to the back.