But basically turn performance, rate of climb, top speed, acceleration, range, weight of fire, firing time, roll rate, zoom climb, ordinance load*, muzzle velocity of rounds, all are things for which we already have solid numbers or could easily test.
It would be complex, it would involve a huge number of calculations, to apply all the numbers one would like to get to all aircraft in AHII. And it still would involve some judgement calls, but would probably arrive at something closer to the truth. Like I say, a squaddie of mine began applying a process like this to a few planes awhile back, with a few surprising results. For instance, just charting the basic attributes of the P-51D against other LW aircraft, it would seem it's ENY deserves to if anything be HIGHER...
*One important choice would be whether or not we want to one category to rate a given plane as a fighter, and then give it a separate attack rating, or all that is relevant for both fighter and attack together.