You are comparing shocks with units that are come later are, more expensive, do not have smoke grenades and require weapon upgrades. This is rather misleading. And if that was the case the could come with 4 PPsh +2 SVTs similar to paras.
In the end of the day they where facing axis unit and there very few infatry that could stand up against them.
And you are completely ignoring what kind of army stands behind these units, so stop these useless vacuum theories.
If shocks had BAR rifles behind them, the echoes from screeching about op from you would be heard by our grand grand kids.