There are more reasons. To touch on all I can think of:
1) aesthetics
2) weight reduction (though minor)
3) ventilation (minor)
4) increased initial bite...this is a big draw for the slotted rotors
Keep in mind that drilled rotors may crack under high temperature applications. From what I've read, the best overall braking force is obtained with non-drilled, non-slotted rotors. Slotting and drilling can both increase pad bite by shaving off the brake pad surface and exposing fresh material.
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2013 Cadillac V-Wagon, RIP Z
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