At the risk of repeating myself, i wrote
"If the brakes have the ability to "EASILY" stop wheel rotation, etc."
If you run wide & sticky tyres & run the test under the conditions that the car normally sees' i suggest that you will see my point. If you normally operate on steep mountain passes at high speed, then braking performance would "need" to be diferent than the more normally driven street car.

Larger diameter, ventilated rotors with large, strong & heavy calipers would be a benefit to a car that can justify that kind of braking performance. All this extra stuff adds to the unsprung mass, diminishing ride quality, & if the brake system from a Bathurst V8 Supercar isn't justified, then using them will not be an advantage over a lighter system that "EASILY" performs all braking the needs that your car has.

L18_B110
I re-read my post, & could not find any reference to retaining the stock 1200 discs. What i said, by using the "killing ants" illustration, was that using equipment that is substantially higher in performance [the 2 lb hammer] than the equipment that "EASILY" does the job [the 1 lb hammer] is not going to be a benefit.
In this illustration, the extra weight of some brake systems is likely to be working against us in a street driven car, which is what most of us drive, most of the time.