Look man, I am not going to argue with you. The abrasives may be the same size, but they are clustered together, which makes them bigger. Have you ever felt the texture of PG between your fingers? Compare how PG feels with how IP feels. I guarantee PG feels rougher. You may be able to use it with a PC, but the the heat will not be there to break the clusters into the smaller particles which allow it to finish like a polish. Really think about it, how do you expect PG to cut more than IP if the abrasives are not bigger.