Update:
it should actually be vice-versa and the three incorect T-34 versions should be changed, because the usual crew order on all other tanks in other nations is:
The STZ has a commander sight, while the others don’t. So the STZ follows the order that tanks that have commander sights work, whereas the other T-34s follow the order of tanks that don’t.
Your only argument for nerfing STZ in very weird way is basically just “I don’t want to remember that versions of T-34 differs from each other”.
It’s completely obvious why gunner position was chosen to be primary position for some tanks. As for some tanks, commander is somewhat useful only when outside of hatch.
On other hand, I think that gunner of 43 variant should be able to use his hatch. I even made suggestion about that.
Whether or not the commander’s ability to shoot should be removed is something I’m not qualified to speak on, but as long as it remains unchanged the STZ will have a different crew order than the other 76 T-34s. I would say to create a different thread about removing the commander’s ability to shoot.