Thats why you use premium infantry like Guards or penal bois to dominate as SU.
And MG42's all over the place, if playing for OST.
Even so against OKW cons are a terrible idea. You are either equal map presence with con spam. Considering con spam biggest attraction is superior early map presence means their main advantage is negated. And you get outscaled like 3 minutes into the game and lose.
Cons are okay against OST. While being horrible against OKW.