You're missing the crux of OP's argument.
The argument is historical guns and consistency, not "Jp4 is UP".
It can be compensated by increased reload time, reduced accuracy etc.
(FYI, other things should be reworked like kubels should get one shotted by ATGs and SU-76 should have better AI performance and worse AT performance, as history goes)
And I really don't buy the balance > history argument if it goes too far. If you want to see 4-5 SU-76s fighting and killing KTs frontally (where you can in CoH2), go and play DOW2 instead. Of course you have to try to stick to the history to some extent.
Historical accuracy is a huge can of worms that is better left unopened. Is it historically accurate for light machine guns to appear from thin air? Or for snipers to survive direct hits from rocket artillery? Did engineers whip out welding torches and repair catistrophic armour damage on the fly?
I think I've seen more vet 5 JagdPanzer than any vet 3 or 5 for any other unit when playing and watching matches.