I think that whats missing here is consideration of the fact that the USF can equip every infantry unit they have with a zook, or even double zooks. A 4-rifles blob firing 8 zooks every few seconds is bad enough as it is, and a dire threat to all axis armour.
Ost can't field nearly as many PG's, and OKW can only upgrade one shreck. This is quality versus quantity again and making zooks identical to shrecks would almost certainly destroy any parity between the two sides completely.
ETA: and making zooks cheaper would only make it even easier for USF to mass blob zooks.
That's bullshit. I see 4+ schreked pgrens all the time in teamgames. It might be cheesy and easy to counter, but there is no reason why USF shouldn't be able to do the same to the same degree of effectiveness.
It would be even easier to deal with on the axis side considering their tanks generally have better durability. Seriously you know what's really unfair. Turning the wrong corner and getting a easy 8 one shot by a schrek blob. maybe it's time for axis to feel a bit of that fear as well.