This game has nothing to do with realism. It's a realtime strategy/tactics game that uses WW2 as a background for it's design.
It keeps the most basic things 'realistic', like a Tiger being better than a T34, to keep immersion but even steps out of that for several units, as a MG 42 suppresses slower than a Maxim, although the rate of fire of the MG42 was unmatched.
So as you have noticed the soviet faction is supposed to be designed as call in heavy: Nearly every doctrine provides you with call ins, while the German doctrines usually offer you off map strikes to support your strong core army.
If you want a realistic WW2 game play
However fun ≠ realism
