What you put in your loaf has much more to do with the way your loaf turns out than what you put on your loaf, but glazing the exterior of your loaf can definitely help you achieve the effect you were after (i.e., soft, sweet, crusty, etc). It is, literally, the icing on the cake. I made a batch of rolls and glazed each one with something different before scoring them. Compare: Let us talk about them one-by-one.