Im not sure about one thing... Are you expecting T34/76 or Shermans to fight Panther?
It's like expecting IS2 to fight Elephnat.
Panther is made to kill tanks. Of course 2 T34/76 or E8 can kill but only when Panther user is braindead.
Point is, Panther should melt medium tanks and should be quite useful against heavy units.
There is a reason why Panther was the best WW2 tank.
The only OP thing I can find about Panther is blitz and smoke.
Great armor + great speed + blitz + smoke. Such combinations leaves you a great hole for misteakes but it's a problem of all axis heavies, not just Panther.
These were the talks around the last armor balancing. After the last march deployment where they Nerfed the KV series of tanks as well as the Panther.
Yes IRL the Panther was great. But IRL there are alot of other factors that dont apply. The Panther was performing fine before the rebuff to the frontal armor. If you go back and dig for the showcase videos of the Jackson vs the Panther they were Asymetrically balanced.
A single Jackson could beat a Panther if it got the first shot advantage and back peddled. The Panther could beat the Jackson if the reverse was true.
This is no longer the case. IF the Panther goes after a Jackson the Jackson is done in 9.9 out of 10 cases.
There is no need for all the attributes the Panther has going for it with no drawbacks. It has longer range, better armor, better speed, blitz, more HPs and better vet then other mediums. The only area it lacks is lower overall DPS due to reload. But its made up for by almost 100% chance to Penetrate.
One area in this list needs to be reduced. If they want to just nerf the OKW version and need a lore reason? OKW is late war and the Germans metallurgy in the late war was hurting. So if anything leave the Ostheer one alone and leave the OKW with crappier frontal armor.