Somehow when I do the same calculations, I get different results.
Vet3 Conscripts in DBP: 678
Vet5 Obers in live: 804
Vet5 Obers in DBP: 643
Obers = 4 * 80 / [0.7 (target_size) * 0.71 (vet3)]
Are you sure you're taking Ober Vet0 target size into account?
I did, not sure if the math went right though.
In any case, the point is that Obers are late game, tech, manpower and munition intensive infantry units that are hard countered by all vehicles, received a lot of nerfs in the past, lost their built in MG and are as vulnerable to wipes to explosions as ever. To reach Vet 4, they need to do an insane amount of killing against lesser foes. So leave their RA bonuses be, they worked for it, any more nerfs and the unit is borderline broken.
And most importantly, either Obers can stay in the frontline even when they see a massive blob and do some damage to it and disencourage blobbing, or there will be just more Volks counter-blobbing once even Vetted Obers cease to work effectively. Which option is better for gameplay?
With DBP, even after all Veterancy they are basically on the same spot durability-wise as what was supposed to be the lamest, cheapest infantry (Cons) by the time Obers first hit the field or UKF infantry in late game craters .... Obers that work as intended and are unique or their watered down version that is basically just as IS squad that also fires on the move?
Was spamming Obers ever really a thing? Was it ever a problem? Because of their AT defiency, they can never work alone. And especially, how can WFA armies retain their double BARs/BRENs as their only justification, ie OKW infantry that dodges bullets literally ceased to exists..?