It really is mainly theoretical but overall I think that all those tanks being too close in cost is the real problem. Ultimately, this leads to only the strongest two being built, which in turn creates a stale meta and allows the stronger of the two to completely abuse its strengths.
But I'm sure the devs will already know how to best solve many of the problems once they come to the late game tanks after balancing from early game up.
I think if they'd increase the Su85 price a little (and slightly decrease fuel cost on Stug plus slight drop of T-34 fuel cost plus some other cost changes), we might see some interesting tug of war play based on the (shock) momentum generated by getting a tank on the field.
So for example it might end up like this, assuming both have around the same amount of fuel:
Ost would get a Pz4 and push back the infantry but after a minute or two the Su-85 hits the field, meaning that the Ost player needs to be very careful and on the defensive. Then again a Stug comes in, so now the Soviet player needs to be careful and on the defensive. Then 2 minutes later the second Su85 spawns, allowing the Soviet player to be more offensive again, soon followed by a second Pz4 or Stug etc.
I still think focused sight and it sniping inf/AT guns is stupid, though