slotted and or drilled rotors

Not any more you don't. I don't work for them.

Yes, saying holes are evil is simplistic, but it also very true. That doesn't mean that they don't have their uses. Would be pretty hard to bolt things together without them.

We engineers are frequently told to add a useless or nearly useless feature by marketing or management. All we can do is make sure that those features don't pose a safety hazard because that is the only reason we are allowed to use to deny their inclusion.

What is used or isn't used on race cars isn't a good indicator of anything. Some racers are very savvy about some things and blind about others. It used to be called the "green valve cover syndrome." If last race's winner had green valve covers and no other obvious difference then clearly green valve covers are the winning ingredient and we need green valve covers if we hope to win the next race.