The issue is that this would be an insanely massive nerf to to Soviets while not affect Axis barely at all. You almost never get more than 1 Elefant or 1 Jadgtiger or King Tiger, but you almost ALWAYS get more than 1 IS2 or ISU.
The Tiger would be seen less, but with some teching fixes Ostheer could rely on the Panther.
I will never get why Axis haters always love to suggest giant nerfs to Allies.
And you have problem with that why?
You clearly have close to zero insight on foreseeing impacts of changes and balance-I'm getting paid to do that. You don't even know what is wrong with the game and why soviets use double ISUs or IS-2s.
Let me enlighten you-to counter double Tigers. Now, how possibly could we stop that without buffing, nerfing or impacting game flow and economy while also encouraging players to actually tech instead of stall for heavy call-in spam?
OH I KNOW! BY LIMITING THEM TO ONE AT A TIME!
If your trying to counter IS2's with JPIV's you going to lose.
Lets ignore the fact that its most reliable, safe and cost effective unit to counter IS-2 unless you are fighting on really tight city map.
Lets ignore the fact that it was already done countless of times by players who actually have a clue and realize they don't need panther/KT on every map at all times.
Lets also ignore that SU-85 will deal with Tiger because of range, Jackson will do because of range and why do you think JP4 can't? Too low range?
Or you simply always assume vacuum situation with no other unit on the map? Which still gives advantage to JP4 because of its RoF, pen and self spotting as well as really good accuracy on the move.