Most of the weapons named here actually require a good deal of practice to wield effectively. It's perfectly reasonably for Rear Echelon Troops to have more trouble firing a semi-automatic rifle while highly trained elite paratroopers can use them effectively. This applies even more to Bolt Action rifles and LMGs.
What it does not work for is SMGs which are rather easy to wield and use in close combat. Not a whole lot of recoil (for most of them anyway), light weight, a high rate of fire and big targets (because they are so close). Assault grens MP40s and Pio MP40s also don't have the drastic performance gap between the two as vehicle crews and assault engies have.
So why do you believe assault engineers(you know, the units that were being send into the fight before main force advance to get rid of blockades/bunkers/prepare the routes for advance together with scouting units, yes, IRL argument, but only to show you that they are NOT smg equipped RETs, but actual front line troops specializing in certain tasks that include combat) should not operate their SMG better then a bunch of guys who were trained in operating a vehicle?
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