who me?
Ich auch nicht . Ich bin immer noch Deutsch lernen.
Ostheer defenitely will need a Panzer III, gut why don't add unique abilities for the tank. It will be weaker than most Allies medium tank, but for balance reason, it should be more agile and menueverable than all Allies tank, as most Panzer III crew are hardened veteran that seen thick armor tanks during the Invasion of France, and should have experience when it comes to dealing heavier armored tanks, Panzer III should serve as a shock and fast attack tank, and possess unique and nasty ability to hindered enemy tanks from taking it on directly. Its should'nt be very cheap, and should possess slightly good hitting power to fight early unupgraded tank. While late tier it have abilities to help it to give anti-armored/infantry support for other Axis tank. HEAT round or hindering/stunt other tank will make it somewhat useful even in late tier.
I would say have the panzer 3 as a weaker version of the panzer 4. have the upgrade in the armoury.