I have thought adding production numbers to a plane balance system would help. Its a shame the OP choose all caps to bring up a good discussion.
It would be interesting to have a historical production numbers plane balance system but perking isn't it in my opinion. Any player should have access to a 262 as an example but say you get only one 262 per tour. Crash it, damage it, or get killed and it is gone. Same thing on the P47M, 152 and so on. You might get say 150 P51s and 200 P38ls per tour. I made these numbers up as a WAG example only.
Missions might offer an exception by not counting against your personal hanger but still have a balance restriction like having only one P47M per mission.
The problem is that you made them up. Your numbers aren't based on historical production, but on what you think should be available to the player. Lets say you get 1 of a type per tour for every 250 built, but not less than 1, otherwise rounded to the nearest whole number. Ok, a single Ta152, Ostwind, Wirbelwind, F4U-1C, but also a single Brewster, C.205, Spitfire F.Mk IX (system will actually allow more Mk XVI's than any other kind of Spitfire) and so on. It gives six Me262s, four Spitfire Mk XIVs, three Fw190D-9s, two N1K2-Js. Twelve to fourteen Ki-84s and a whopping thirty-three P-51Ds. As you can see, the numbers are all over the place and not related at all to the power of the unit.