Actually Jab, I do see your point. However, they see your point to, they are just calling it by a different name. Most people that prefer early war aircraft would like to have some sort of RPS or some other system that limits plane choice. This is for the reason that your describe, they want their plane to be competitive. To a Hurricane I, these planes are essentially the same plane - LA-7, P-51D, 109G10, 190D9, ME-262. All are untouchable. Except in the event of horrible luck, horrible SA, or horrible skill on the part of the la7-P51-109-190-262, the Hurricane 1 has NO chance of scoring a kill. A "fight" (and I use the term very loosely) would consist of the late-war plane making firing passes on the early war plane (much like how people attack bombers, except add some turning by the target). They aren't "whining" because their ride can't compete- they are just stating a fact.
Much the same situation would occur were the Me-262 or Tempest unperked. To a P51D, a Me-262 is just untouchable. A P-51D has about as much chance of killing a 262 as a Hurricane 1 has of killing a P-51D (Although with HTC's rather 'generous' DM for the 262, it is fairly easy to bring down, I was hit by a grand total of 4 .50 caliber bullets from d1.1+ (one landed from d1.6) which took out both engines, I was dogmeat then)).
The only difference is that even though I am a HUGE 262 fan (well, not really), I can't fly my favorite plane because it is to superior to the other popular planes. You can still fly your favorite plane, and you don't want anyone to take it away from you. I can understand that view, fortunately since I am not a fan of any one particular model of a plane I will have a plane to fly no matter what the planeset is.
Also, I don't think Aces High can support two seperate MA's. You can look at the experiment that the CT is, and it was intended to be a 'second' MA. The only time I've seen more than 50 people in it was when the MA was down. While again, this is not a problem for you (since you'd rather see the P-51D in the arena than 80 different types of early-war planes) for people who happen to want to fly an early war plane in an environment where they aren't just a target it is of some small concern. I think HTC will eventually make a decision regarding a RPS and/or seperate arenas, and I trust that they will make the decision that will make the most number of people happy.
Hell, I'll even let you say I'm wrong, and that a Hurricane I will be able to kill an La-7, P-51D (or actually... really any other plane that isnt from 1940). You can fly the Hurri, and I'll fly any other plane you want. Then we can swap roles.
The truth is that you in your P-51D ARE their Me-262 if they are in anything slower than a Spit9.