Yes, volks have bad scaling, that's because it has become reliant on its schreck upgrade. We are trying to make the volks go sober.
Schreck promote blobbing and discourage tactical play. The biggest advantage of a schreck is its alpha damage. This mean the upgrade actively encourage the player to spam and blob his infantry for the ability to one hit tank.
On the other hand, a lone schreck volk is weak against infantry and meh against tank. There's a reason why the allies avoid putting bazooka and PIAT on their line infantry. US usually put bazooka on their Rear echelon since it leave their rifleman free to fight infantry.
One Faust is a lot more threatening than one schreck since a damaged engine leave them significantly more vulnerable than a lost 120 hp. A faust provide synergy with the OKW's other ATW. It allow your infantry to contribute to a tank battle without needing to be massed.
In addition, now that the volk kar98 is actually decent, getting the schreck will mean a noticeable lost in anti-infantry. Combine with the terminator veterancy on the rifleman and conscript, this mean volks actually turn into crap late game.
I want faust on schreck because I volks to be useful for more than just blobing and spamming for that Alpha damage. A Faust would give volks a lot more tactical option than just going for that critical mass. A change to faust will be a buff to the volks.
if they do blob volks. just don't use light vehicle. use Anti-infantry infantry to counter them. what's your problem?