I find that hard to believe. If you really did, you would've noticed that the changes only nerfed the IL-2 rocket strafe's damage from 80-90% health to the rear of an Elefant to 70-80% on average (though more against the front armor), and I assume you wouldn't call this "drastically nerfed". The rockets have a high amount of deflection damage. The penetration nerf only took the edge off.
And in the new patch the b4 has the potential to deal more damage than live. A perfect scenario isn't a realistic scenario. For something you are going to have to combine with a 300mp 90fu sacrificial lamb there shouldn't be that much RNG.
"taking the edge off" is fine and all until the enemy limps away because RNG said your ass armour hits are all bounces and you threw away a tank for a little down time because you have nothing capable of following up as the roster is designed to rely on abilities instead of units to fight that specific unit.
Taking the edge off could be completed in a way that DOESN'T turn a reliable ability into a sacrifice and a dice roll. Reduce the damage if you feel it's overperforming but why nuke (and that IS what is happening) the penatration value. HELL if anything it should be guaranteed to pen, not left up to RNG if you need to follow up, after throwing away a tank, with an all out push. At least then you can tune it EXACTLY to the output you want instead of the chance that it acts as though you didn't change anything whatsoever.
The answer to an elefant shouldn't be "drive a tank at it into its 70 range (and increasing because it's fleeing the t34) and hope it doesn't hit a mine, or any support at all, then call in a strike which you must line up and time perfectly, and then slit the wrists of your neighborhood homeless person and utter a chant to RNG that these rockets with the same pen as a t34 at max range doesn't bounce as often as the aforementioned t34 who is so unreliable in the role of tank combat that its only contribution to this fight was suicide"
The solution to an overperforming ability should never be "let's just make it so it doesn't always work" it didn't work for simply cranking up the scatter of tanks like the is-2 or ISU because all more RNG does is... Increase the RNG and not the underlying issue.
At any rate, the real issue lies in that the soviet are I'll equipped without abilities like this, less than the ability changes itself. If the ability was an "option" instead of a staple it would be less of an issue. By your own example the way to use the ability is to sacrifice a tank and then get this to do all the rest of the work, which puts a lot of weight on the ability itself leaving little room for the RNG to bounce of the ass of the units it's meant to destroy.