First of all: AT has always been great for units to vet up easily. Why? Because you are facing with "cheap" units an even more expensive unit. Reason why AT guns vet quickly.
Second:
This are the bonus for Volks.
-10% received accuracy
+30% accuracy -20% weapon cooldown
-10% received accuracy Healing when out of combat
+40% sight range +30% accuracy
-29% received accuracy
Not every squad get defensive bonuses at vet2 (Grens-Osstruppen-Conscripts-Penals-Irregulars-Obers-PF). Obviously an extra man is better on terms of survivability so i don´t think anyone would think that vet2 PG -JLI-Falls (-29% RA for a total 1.45armor) are more survivable than Volks.
And if their are now tanks then how do you vet them up? and the best defence is a death enemy. thats the problem of volks they simply cannot kill late game while scripts still can use their molotovs and can significantly reduce the flexibility of enemy tanks with their at nades. so their volks ai defintly need some looking at.