For track use slots do provide a useful function, so do drilled rotors (but the cost out weight the benefits imo). I just won't use slots for a daily driver since they will eat through pads much quicker and have little function in daily use, the OP didn't mention track use so I assumed that wasn't a factor.
The carbon disks in F1 still do the same thing turning kinetic into thermal energy through friction which produces dust. Carbon is used because its much much lighter then steel and has much better thermal properties. But that's a discussion better left for another thread.
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