I think the addition of the T-28 Model 1940 Soviet tank as a br3 would add just the right amount of vehicle verity to the USSR. It’s got a bit better armor then the T-28E as it’s frontal armor thickness is increased to 50–60 mm up from the original 30 mm of the main production model and even had another experimental version of the 1940 variant supporting a 85mm cannon.
The only one that interests me is the version that can carry the 85mm gun. If the original 1940 version were brought back, it would seem too repetitive. And it might be another obstacle that hinders the advancement of the player’s technology tree.