Difference between same unit types 3485-p4 and katy-stuka is smth like 500MP/100F. Doctrinal panter come at the same time as garbage m4c - 10CP.
Late game tanks arent supposed to be spammable. Last 2 games - 1 panther and 3 P4 - this is absurd. Other game 1 panther and 1 p4 - very early. I never saw anyone who was able to get IS-2 and 3485 at the same time - so OKW should not be able to do it too. Revert resource penalty or make them actualy pay for new units unlock.
I think it should be adressed.
OKW has the highest cost tanks in the game with no abilities to boost resources. Panther/200fuel and P4/150fuel. If your opponent has 1 and 3 as you claim then you had been loosing for a long time. Really isn't design problem but a skill problem.