I can understand that powertrain and aero packages determine PP. But what about the tires you equip? Take 2 cars straight from the NCD and compare lap times between the 2 each using different compounds, one using SH and one using SS. Theoretically the one with the softer compound should be faster. Don't take in driver error or anything. I don't know if that will cause more problems when racing online, than dictating either PP or tire restrictions?