This may have already been posted in here, but I thought the reason for drilled/slotted rotors on modern set-ups was to "wipe the pad" when braking. That way it's always a fresh surface that is free of dust and glazing so that you get a good, solid bite right off the bat and a more consistent pedal feel. Is this a misconception?
A guy I used to work with had a modified SHO that he ran at track events. He had a pretty nice (read expensive) looking two-piece, aluminum hat, slotted rotor set-up. He swore by it. He hated drilled rotors, though. He had a couple stories about guys with drilled rotors having them crack, chunk apart, and, in some cases, explode at track events. It would punch holes in the rim and blowout the tire.
He did have a tendency to exaggerate, though. So that could mostly be BS.
EDIT: Almost forgot. Great post. Very well plotted out.