They can still hold and use the most powerful upgrades in game and deal the same damage as any other specialist, expensive unit. That's the issue. Imagine ostruppen were able to pickup an lmg34 and a panzershreck at the same time
And btw, with those upgrades they vet up quite fast and get one additional model so I wouldn't call tehm squishy at that point.
Most powerful upgrades in game? Are we playing the same game? Because BAR and Zooks don't equate to LMG34s and Schreks. Even then, its the same thing where you are paying the
Munitions for the Weapon's DPS - whatever squad lugging it around doesn't really matter. 2-3 models of the RE squad are still lugging around their derpy Pew Pew rifles... if you pay 120 Munitions of course their DPS will go up. Rifles still have better Vet and DPS with the same weapons, you are just choosing to sacrifice that for a less effective squad that is cheaper. Regardless you are limited by Munitions.
The same would go for Osttruppen; the only difference is that the commander has a Fuel -> Munitions conversion which would let you spam upgrades which is the only way that it would be broken. Not like the Mobile Defense Ostruppen with LMGs are all that overwhelming either lol. Besides, Weapon Racks are a core USF mechanic whereas for Wher. its not. Its simply not an issue.