This looks like a feature to me!
Just add it to the pile, like passing population capping point thanks to Vehicle Crews, or cancelling the delay on Critical Repair by just jumping back in when the animation starts.
Stuka costs 200 too. I hate these abilities, but I hate the stuka the most.
Unless you react inmediatly, you can say goodbye to most of your tanks destroyers, M10s and M36s rarely survive even the first round, then the planes return to say "fuck you" a 2nd time.
P47s actually cost 240, that's quite pricey, but they are really good vs heavies which USF struggle to finish off so it's ok.
All I can say is that the maps are super pretty, and in one of my games the elevation on Westwall made AT guns feel redundant, but besides that it's a really good map.
Their problem is having a Unit that can be fielded within the first 10 minutes with a tremendous shock value, and capabilities to commit squad wipes, even for early retreating units.
It's called the t70 and Stewart
Both able to self heal
One able to instant repair crits
Both able to insta wipe OH units
Both have better AI capabilities then the p4/Panther
Most players are able to get these units to vet 3 and keep them alive well into the late game.
But that's more Light Vehicles rather than needing a nerf than Panther needing a buff, since you are basically saying their shock value before a proper Medium Tank gets up is too high and that I can agree with, but buffing a late game unit when a nerf is what is needed to something else is bad policy.
Soviets and US don't have Comets or Cromwells, something to keep in mind!
You could try making the Panther better squishing so its a dangerous to infantry while putting itself at risk, Wehr's Panther at least, as OKW is better off paying a bit more fuel for the Command Panther which is stronk.