Volks have animations for firing rifles, so they can use the G43. I don't know about the StG 44 but it would make sense of them to keep some sort of upgrade to stay relevant.
And yes you could go for call in infantry, Panzerfuss spam would become even more common since they already have a snare (if kind of a shit one), an extra man, and a AI upgrade as well!
I still fail to see your point about why Volks shouldn't get an AI upgrade when every basic infantry in game is capable of getting one.
Yeah, that was my fault. They can use G43s.
Of course you can go for call-in inf but 1) doing so every game would be boring and 2)as I mentioned earlier, that would be a huge manpower drain.
My point is that Volks don't need to have an AI upgrade. I wouldn't mind if they get one but it's not absolutely necessary. They do a good job vs enemy inf - especially early game with Kubel support.
Volks could get an AI upgrade unlocked when T1 and T2 are converted so that people don't have to rely on Obers every game to deal with infantry.
As I said, they're balanced vs Cons, meaning that they can win/or lose depending on the situation. Once they start vetting up (whch they still can rather quickly - Pzfaust hits give them nice EXP boosts) they surpass Cons.
Every squad except Cons you mean (at least without the right doctrine).