Lategame doctrinal artillery call-ins onky happen once or twice in 1v1, they are similar to dow2 top red nukes in this regard. I specifically left them out of the indirectfire/artillert discussion becausenI agree, they are relatively balanced and additionally, rare, due to munitions cost which is a resource used in CoH2 for a wide specfrum of unit abilities and upgrades, unlike DoW2 req/power upgrades and abilities. Red=/=Munitions.
What about ZiS and Su76 barrage? Your opinion on those as indirect fire options that have no Ostheer parallel?
Well, SU-76 is fuel spent on one thing, with very little in the way of AT capability. While it can dish out respectable amounts of damage with its barrage, it serves that singular function. Really, it's no more effective than ZiS or a mortar for that matter, for what it does and what you pay for it. ZiS on the other hand is 60 munitions per pop, so again they're paying for one thing and not for say, TM-35 mines.
SU-76 means it's likely that your StuG can hardcounter it, and should an SU-85 make an appearance that's a boatload more fuel they've spent. Losing a StuG to learn their numbers is well worth it, and you can bank on spending MP on infantry to outfight theirs, and (hopefully) being able to work around those pesky barrages. PGrens are especially effective as they can force the Sov to either move units away (less damage done) or just outright not barraging you until you retreat.
ZiS barrages work against the Sov if you can dance around them. SU-76s are hardcountered by tanks and even the SdKfz 222 2cm AC Scout Car can take them out with some good micro. Once you see the enemy going for Barrage-centric tactics, you know that IeFH can play a huge role in taking them down a peg or two.