So you think Ostheers can't have 2 panther and a pak and still have a lot of infantry?
Same as OKW with JGTiger and one reketen and still have infantry.
I have played many 2vs2 games and as far as remember I have never managed to survive as Ostheer to late game (build T4 and 2 Panthers) relying in single pak as you describe in you scenario. It is simply not realistic.
P47 is an Expensive late game ability and should be efficient. And you still have the chance to escape and to avoid.
Like Air Supremacy Operation.
JT comes later and is a far more expensive ability, so in that sense, calling a P47 should not be able to hard counter a JT.
That is exactly my point, P47 should not become "air supremacy operation" a badly designed ability with no counter, than to retreat and pray that enemy planes will stop before bombing you base.
Keep also in mind that USF and UKF are completely differently designed faction and UKF are designed to have powerful off map abilities. Asking for USF to equally powerful off map does not mean that it would actually help balance.