In a vacuum Ele can't deter a 34/85 either because it will just drive next to it.
ISU has almost KT Armor (340 armor ) so it can tank shots forward, if you let yourself be flanked and dont support your assault gun its a l2p issue
You want the infantry wiping potential with huge range AND Elephant grade AP ammo to beat the Hans out of their tanks? Lol no. As far as I know ISU is still somewhat meta, can deal with both targets and deals enough burst damage to armor. It is not a dedicated TD like Elephant. It also gets a pintle MG against infantry, which ele or jagd does not. Soviets ALSO get Guards AND Mark target in the commander which adds bonus damage.
Also "its bigger gun so needs to deal more damage" doesnt apply . 122mm? of IS-2 deals the same damage as a goddamn peashooter 76mm because logic doesnt apply in this game sadly
It is more about deterring the flank's presence in general, I rarely risk a T-34 dive into a superheavy because anyone with half a brain is going to keep their Elefant/Jagd defended. On top of that, in team games where the superheavies are actually used, there's likely to be another tank nearby to come in and save it, and the axis will usually win in that engagement unless circumstances heavily favor the allies (no MGs to supress infantry, which there usually is atleast one of.)
Except the AP/HE split is exactly what prevents it from wiping infantry AND tanks, the pintle MG is unimpressive and tacks an additional muni cost on top of it, the Elefant has a bow MG, which is what makes it an Elefant and not a Ferdinand. It's more expensive than an IS-2, less mobile overall and limited to a casemate, why shouldn't it be better than the IS-2 at destroying things?
I'd be perfectly in favor of rebalancing damage to be accurate according to caliber, though that'll never happen, I still pointed it out because the fact that an 88 deals more damage than a 152 is utterly ridiculous.