I gave the T28E a try due to your recommendation and I have to say I regret it, it seems way worse in almost every aspect, its armor is thin to the point of been useless even in its improved variant, it is quite slow compared to the T50, the short L-10 76mm still fails to penetrate armored opponents pretty much at the same level of the 45mm , and it is too tall, making it really easy to spot. its only advantages are the extra MGs and HE explosion radius, which is pointless as the T50 can fill the same role to nearly the same extent without incurring in the same penalties.
If anything it served as a history lesson of why the soviets abandon the design so early in the war, it is a WW1 mentality design of an infantry tank, which was obsolete by the start of the war.
finally I tested its armor against tier 1 tanks after seen how easily it was defeated in a match, just to find out that the 37mm is good enough to kill the T28E variant from any angle without much effort and that the tier 1 75/32 M41 outperforms the T28E in penetration and armor, while keeping similar HE performance, which makes me question more the tier 2 rating of the T28E