so i guess you have done the math... to know the surface area you are no longer contacting... pad to rotor... and taken into account that the pad wears each time you apply the brakes and that "wear dust" acts as a lubricant between pad and disk... with the drilled disk... this acts much like your tires to the road... yes slicks give you more contact area (and build up more heat) but once there is lubricant (water) tossed into the mix you need to channel that away... just like the brake dust... you do the math... but you need to know the friction coefficient of the brake pad itself before you can make any statement that is valid...
long story short... you just don't know of what you speak...
I learned the brake performance aspects from a friend who worked at, and designed a significant amount of systems for non exotics, a specialty brake performance company. They specialize in exotic cars (Ferarri, Lamborgini, Porsche) brake components and upgrades. The friend designed upgrades for Subarus and Evos when they weren't available.
He and I built some autox cars and I've also been racing them for quite some time. Through the years of being on forums with individuals who have raced these cars for decades - the short answer is yes, cross drilled rotors on the street don't increase any braking ability and generally the rotors never get warm enough to necessitate the cross drilled feature. Further, brakes work best within a temperature range and not getting them up to temp reduces braking power as well.
The problem with your analogy would be like comparing slicks from the 1960s to solid non vented rotors of the 1960s. It has nothing to do with today's components.
Brake rotors are almost always vented these days, which helps pull away dust. Pads are chamfered to help reduce and pull away dust. The components are designed to work in most everyday situations for that vehicle. For our vehicles that includes everyday driving, some off road, towing, etc.
Can you make parts have increased performance from the original/factory intent? Of course, but with anything, there's downsides. The downside of increasing the braking capacity within a higher operating temoerature (like certain pad materials, rotor materials, rotor design) means you will have reduced capacity at lower temperatures.
