I never see Tokyo fall against an experience Revised player.
Actually let me rephrase that; I’ve never seen a game where the Allies managed to take Tokyo, without also losing Moscow in the process. If you stick around to finish off Japan, then the Germans will almost always break Russia. This throws you into the typical KJF endgame of a super-Germany (Eurasia) vs. a super-USA (Pacific). With income roughly split between Germany and the remaining Allies, it turns into a production/logistics game which tends to favor the Axis.
This is why many people think that KJF (‘kill Japan first’) is a misnomer, because if you actually invest the resources to kill off the home island it invariably comes back to screw the Allies during endgame. Instead what you will usually see (if anything) is a quick smash and grab maneuver, with the Allies just beating Japan into a position where they can be contained, before redirecting all resources to the defense of Moscow. The strategy is all about ‘timing’, and more specifically ‘keeping time on your side’, because you don’t have to take Berlin to win this game, you just have to prevent Moscow from being captured.
If you removed the production limit on Tokyo, I think it would make a KJF strategy even more difficult than it already is, because the Jap player could just start inf stacking the home island. By the time the USA built up enough production to match Japan’s, chances are the German tanks will already be sweeping down from Moscow to recover the Axis position in Asia. If you removed the production limit on all starting factories (and not just the capitals), I think it would also give a strong advantage to the Russians, since they could drop 8-10 units a turn into Caucasus, which would be a total nightmare for the Axis.
I worry that we’d be trading one set of circumstances that favors KGF, for another set that favors KGF.