Hah well see the dam thing makes my target 240whp at something like 4500rpm! In our racing class we are defined by a simple formula of Weight / Horsepower (average). I want to be in the class with 10lbs / hp and with a 2400lb car I need to average 240hp. NASA St3.
Most cars have a relatively peaky power band, making lets say 200hp at 4500, 235 and 5500, 260hp at 6500 and 235 at 7500 (imagine for grins this averages to 240hp).
But if you have another identical car that makes 240hp at 4500 and at 5500 and at 6500 and at 7500 you are maximizing the "Power under the curve" and all the guys that do this are just plain faster (not only for reasons just related to hp of course, but the idea stands).
And so that is where the desire for a giant engine with a de-rated power band comes from. Just this year they made a new rule to address the advantages of this type of setup so therefore it must be a competitive advantage lol.