I agree that authenticity should be part of the game. I start to think that Penals should be doctrinal and Guards or Shock troopers might fill the role of T1 infantry (preferably Guards since they have a PTRS).
For the same reason I also think the Panther needs a serious overhaul. It´s pretty much not WW2 if it gets easily defeated by Allied mediums while Brits run around with armor superiority with a tank that saw usage for only some minor engagments during the last 4 months of the war.
If the panther needed an overhaul in the name of realism, then the first thing to happen would be it constantly breaking. Then we would have to increase the cost to make it around the same level as making 7-8 shermans. Then the panther can be made to easily defeat allied mediums. Realism has its place, but so does balance and gameplay.