I recently played VCOH again and I am once again reminded how much I miss the Sherman vs. Panzer IV/Stug IV dynamic. The vanilla Sherman was weak AT/Strong AI and a universal upgrade could turn all Shermans into Sherman 76 so it could compete with the Panzer IV. US also relied on the cheaper M18 or M10 with the 76mm gun.
As a German player, you had the Stug IV and the Panzer IV, although in different (but not expensive) tiers.
These were crucial main-line tanks yet in COH2 they made it completely asymmetrical to the point where one has to rely on Call-ins if they are Soviet. There were things that deserve to be asymmetrical- but making T3 amazingly asymmetrical was not one of them.
The T-34/76 is kinda the same, the difference with it is having a weak gun and weak armour. The Panzer IV Ausf. F1 vs the T-34/76 does share that dynamic, oddly enough. But that's not featured in the multiplayer game aside from the Panzer IV Command Tank.
They they swapped the SU-76 to T3 (preferably swap places with T-70), that'd bring back some of the Infantry Tank + Tank Destroy dynamic, and would go a long way to making Soviet late-game feel good.
The Panzer IV / StuG IV dynamic hasn't changed much imo, except now it's a StuG III instead and it has longer range with more emphases on the Tank Destroyer role.
I agree that Soviets rely too much on call-ins, this seems to be a side-effect of the game being shuffled around.