So it cost less. OKW panther comes way faster in the field than Ostheer one, so at the end OKW is never late in his teching, it is quite the opposite actually since OKW can deploy his T4 faster than any other faction. OKW isn't starving of anything.
Anyway, the only wish is to have from this patch is balance stuff, 6 months to build it is quite a lot and we are clearly in right to expect something working and bug free.
You are far to optimistic in my view.
But if "balance" for you as for some people on this forum means simply "nerf OKW" you will get what you want, I'm sure about it.
Not necessarely the OKW Panther's case here, but you might want to take into consideration that the fuel income has verry subtle effects that not everybody is aware about.
Cheap teching in fuel starvation conditions means that you will be able to produce a vehicle as fast as your opponent does. OKW is able to bring a vehicle in due time and when it's needed, no question about it.
BUT the effects of fuel starvation (DO NOT FORGET about the fact that the income cannot be boosted as every other faction can, without sacrificing AMO. Not Manpower, but AMO which is also important)is that you will not be able to produce to many of these vehicles along the game and quickly. Which means that IF YOU MAKE A MISTAKE YOU ARE USUALY TOASTED. Of course you can build directly panther which is more durable and can be kept alive easier. But how about the paper-armored vehicles from T3? Puma, AAsdkfz? And they are usually needed in early game. Can my puma fight with your 2 T34/76s? It can, if I am a better player than you and maybe will stay alive. If we are equal, you will probably lose an T34 if I am lucky, and I will lose my puma. You will replace your T34, I will not replace my puma. That's the way things go, and we have to stop denying this and call OKW "OPW" just because it has few better units. It's normal. It needs them.
So in the end please compare the 100% fuel income you receive as allied OR ostheer + 3 fuel caches which will boost your income, with 66% "OPW" receives along the game and see how many panthers can "OPW" build and how many shermans/EZ8s/jacksons OR T34s/SU-85s/T34_85s/IS2s you can bring.