True, but if we were so worried about that, then we should be looking at lighter flywheels, torque converter, etc. Those are rotating faster then rotors... and the energy required to rotate something is proportional to the rotation speed squared. With a gear ratio in first of about 3:1 (not taking converter slip into account so the crank is spinning even faster than 3 times the wheels), your components spinning at engine speed have way higher of an effect (would take 9 times more energy to spin the same mass). My point? Why don't we look into lighter weight engine-speed components?
I'm just defending my desire for better brakes