Giving a choice between Schrecks and STGs wouldn't solve anything. There was a reason why they were removed from volks entirely, and that was to prevent blobbing. It would only make the problem worse. While I do agree that the lack of handheld AT is a bit disconcerting, the solution wouldn't be to give it back to volks. Giving Obers a HEAT grenade would be rather pointless because:
1. They're dedicated AI
2. It isn't a snare, yet it costs munitions for every use.
3. Volks have the panzerfaust to cover for that.
IDK, I'm inclined to disagree. Giving players an option to Upgrade STGs at the very least makes the Shrek upgrade less of a no-brainer since even Vet 5 Volks struggle with upgraded infantry and can consider an AI upgrade. Realistically you can only build so many Volks and even if you build 5 then 2 STG Volks + 3 Shrek is a lot less obnoxious than 5 Shrek Volks. Of course many players will still opt for all Shreks but if Relic decides against OKW 3.0 then at least the Shrek spam in theory can be mitigated somewhat.
The Ober suggestion was more of an off-the-cuff idea I just feel like some kind of mobile AT is needed... my other idea is to give Volks 2 Fausts that share a timer. One is the OST version and the second is the high damage version with no snare (unlocked at T4 to prevent light vehicle rape?) The perpetual munitions sink would suck I admit but its supposed to be used sparingly as support not like Shrek Volks are used now.