Hello, I believe there are certain sandpapers that when you get to certain grits they become polishing pad like and holes are not needed for smoothing like action. The Platin2 series papers from 400-4000grit all are foam pads and the small amount of dust created by using them can go trough the foam pads into the vac, but not much dust is really created anyway. I am not 100% on the Titan ones though as I have not seen the higher grits, most of my customers are wood guys. Maybe some of the more automaker festoolians (titan users/sellers) can chip in on that.
Thanks
Shawn