Well, most of the time you and I agree, but in this case, your interest theories are not exactly accurate?That's because even actual race cars don't use that drilled crap, and the only race cars I can think of that uses slotted is NASCAR, the very races where brakes are hardly used!
I will agree that on most street cars having either or both drill and slotted rotors in most cases has no benefit except aesthetic value the performance look of a racecar... or just KOOL looking! . On the performance side for what they on a sanctioned track vs the street is very different. And most that are available for OEM replacements unfortunately most drilled rotors are not drilled correctly for the finished product, and these are the ones you often read that have issues, mostly cracking or breaking. There are some slight benefits on a street car for slotted rotos but very small.
As for competition many like NASCAR depending on who is building it may use none drilled or slotted rotors preferring more braking surface area for braking which is lost by when you remove any of the surface of a rotos that make pad contact.
When I machine the rotor from high quality machined raw discs I am carefully with not build fictional heat during the machining and drilling rotors I micro polish every hole from front to back. My rotors have never had any incident of fracturing or breaking.
Drilled and or slotted rotors on a street car with some wheel designs you can see clearly the rotor and IMHO KOOL! All my vehicles for the "KOOL" drilled and slotted rotors.
This the most resent MAZDA BBK rotor I machined drilled for an application that did not offer both drilled and slotted rotors in the size needed for the BBK kit.