Light vehicles have paper for armor, that's what is implied in LIGHT ARMOR!
Nothing the Germans have even really comes close to instantly wiping infantry squads! (save for the Stuka zu Fuss, and that's only if you managed to hit the same squad with 2x or 3x rockets from the barrage!)
I can't comment on the Beta since I haven't played it, but I am playing live, have been for a very long time, and it's just SHIT!.
Infantry squads have paper for armor, that's what is implied in INFANTRY!
^Not a real argument, but whatever.
THe germans have plenty of options for wiping infantry. In fact, the germans have 3
nondoctrinal units to do so. The Brummbar has the exact same AOE value as the ISU, and it has a vet artillery strike. Then there is the Panzerwerfer, which fires 12 rockets at a single position from far range, and is usually either a wipe or heavy damage to any infantry in the area. Finally, there is the Sturmtiger, which can instawipe very large concentrations, shoot through buildings, and even cripple/ instagib vehicles. Germans have plenty of options, they just usually don't bother to use them in most games because they prefer to use Tigers.
EDIT: sorry, forgot to respond to everything: The Stuka can wipe squads with a single rocket, which is not hard to hit because it is deadly accurate.