An impressively poor understanding of modern friction materials - so you think if something has a coarse texture then it will make a better brake pad material? If that were to be the case then stone disc pads would be all the rage and yet strangely they are not...
Just think of a clutch drive plate in manual clutch - same idea uses a friction material to provide a progressive drive take-up until the pressure plate has squeezed the drive plate or disc to the flywheel....the flywheel will be shiny smooth.
Modern friction materials are remarkable compounds that retain consistent friction properties across a wide range of temperatures from stone cold to extremely hot - at a surface level the disc is near being vapourised hence the very fine dust. The cheaper disc pad (often found as OEM fit) materials are often found with flakes of metallic compounds and these provide for accelerated disc wear characteristics, the more expensive pad materials tend to be more ceramic in content. If we go all the way to Ceramic rotors then the life expectancy is huge - the pads are designed to provide fabulous performance without prematurely wearing the discs.