this is often something of a paraodx. It is true, hair transplanted hair will be more abrupt and coarse than a person with a natural head of hair, but if the density is too sparse, that too will look unnatural. As you will still have the coarse hair, just spaced in a way that looks unnatural. I think there is a leve lof compromise. Maybe slightly less density, fort the hairline, but not so much it just looks like your hairline suffered a forest fire sparing a few thick oaks.