While I agree hirashin is complete in the sense that Naruto cannot improve on the teleportation aspect of it. However, he could add to the number of locations he can teleport to, by attaching it to a clone he can manually control where he wants to end up, whereas with Minato he had to either have a seal in place from before, or place/throw the seal to where he wanted to go. With the clone Naruto can stay in one spot and make the clone travel around, changing the teleportation end points from a single point to infinite points.