More than anything, I think you're seeing the result of an inaccurate "pilot" model. "Incomplete" is probably a better word than "inaccurate".
Numerically, the plane may very well be modeled about as accurately as possible (as of yet, I've not seen anyone post anything conclusive (at all) that shows the F4U doesn't fly right. It's all been subjective so far, for years...
However, while the AH F4U is a very "busy" plane to fly well, it wouldn't even be possible for a RL pilot to do what an AH pilot can easily do. If an AH pilot was limited to only being able to do what a RL pilot could, we wouldn't be able to get the AH F4U to do what we can make it do now.
While I feel this is true for all planes in AH (since they all use the same pilot), I think the issue is brought to the fore with the F4U (and likely other "busy" planes).
One example is that given by Ardy, in that we don't "feel" any of the effects of G's, or fear, or exhaustion, etc...
But what I'm referring to is (for example) that an actual F4U pilot wouldn't be able to manipulate throttle and flaps together (at all), while it's extremely simple for me to do so here. This allows me many other options in AH than I would have in RL. Those extra "options" mean I get what amounts to extra performance (even if the plane were modeled absolutely perfectly).