Because they are so survivable, and mobile, they can get in to throw and run.
So you are saying we should nerf the shock troops as well. They perform 10x better than AG and have that nasty smoke nade... which they use on my MG42. Lets not forget that you need to bring 2-3 squads to kill em.
The problem with the soviet industry is in the FUEL. They get a lot of fuel fast and there is the core problem. When you have the fuel building faster or slower wont matter.
What they could do is maybe move it to 2-3 CP, this way the germans would have some time to prepare. Also it will still boost the soviets with more fuel and they can pump out more tanks late game.