Btw a fun fact about unit design and its realism in comparison to ww2 facts is that before the german invasion of the soviet union german main tank was panzer IV. It was after the pIVs clashed with newly manufactured t34s that they found out that pIV are inferior to t34 in almost every way. They couldnt even penetrate its armor because it was sloped. Based on t34 germany designed panther and tiger tank was supposed to match KV1s armor because KV1 unkillable for german tanks before that. So much for historical accuracy. Soviet tanks were actually on par or sometimes superior to german tanks while also being cheaper. To counter panthers and tigers soviets designed t34/85 which had all the cons of t34/76 like its mobility but was far better armored. It had a stronger gun which made it able to take head german tanks being the best allied tank at that time.
Fun fact: they didnt have radios (only command tank), bad optics, very cramped vehicle interior (due sloped armour btw)(=bad reloading time,especially if the upper ammo is empty and they need to reach the bottom of the tank for new ammo + 1 penetrating hit nd atleast 2 crew members are dead, (very)bad trained crews and a huge variance of Quality for the used materials.
So yes coh does not really represent units historically, i still dont get Your point.