That's funny... Because I actually do laugh when I see players pull chunks of sandpaper out of their cases....lol
Guns don't kill people
Kidding aside. For me personally, all what I want to do is recondition my tip so it will successfully strip chalk from the cube.
I do not want to alter the shape at all. So in this comparison we can either opt to raise ridges by creating gaps in tip fibers with a pick .vs. tearing/removing fibers with sandpaper. The choice is an obvious one for me, given the end goal.
Now can a miss-used pick damage a tip and or ferrule...?..., hell ya. Will it if you're using it with any care what so ever...?..., no.
I'd sooner use a scuffing tool as an embossing tool, before literally sanding my tip.
As a general inquiry... Do the sandpaper proponents not consider a layer being removed by the sanding process a delam of that top layer..? Or is it because they're already shaping their tips that it's inconsequential...? When you think about it. It's far more likely to lose layers with sandpaper.