Imagine this:
You're flying on a side affected by ENY, so you're fighting P-51s, P-47Ns and Ms, La-7s Spixteens, late-model F4Us, etc. with what basically amounts to a mid-war plane set. Inevitably, there's going to be parts of the map where even though you're hurt by ENY, you're actually OUTNUMBERED 2-3 to 1. This is NOT a funt place to be.
NOW imagine that same circumstance, but with the enemy having access to free Tempests, F4U-4s and 262s.