Agreed, and I think that is where the issue with ponies running comes from. Most people believe like BnZs said, "Because it is the second worst turning fighter in the game". If you push it a bit and is a decent turning plane, one of the best at speed. The biggest trick is just knowing when to turn and by how much.
Nope, you can't "push" a plane and make it turn better than the interaction of lift, weight, thrust, and drag allow. Physics is not altered by gumption.
This saying a plane "turns well at speed" is almost meaningless* because every plane in AHII turns about as well at the 250+ mph where all turn is g-limited anyway. A Pony a Typh a Spit a 190 pulling 5gs at 300mph are all producing the same rate and radius of turn.
You can fly an angles fight *less badly* than the other guy, and I frequently do in the Pony, but that is mainly because the other guy isn't managing his own speed well. The sort of thing that is above the pay grade of the average MA stick. I've flown a lot of planes into seas of red in furball lake, my way of wringing them out, and I gotta say the P-47D-11 is no question better for such operations than the Pony.
The good thing about the Pony is that it can generally force/deny the engagement, and given an "in" to gain position, it is such a good gun platform that it stands a chance of getting a lethal shot on anything in the game in a 1v1. But the Pony driver who isn't certain certain he is in a 1v1 can easily get in trouble killing speed to get that one shot in, because once slow and cornered it has far fewer abilities than most fighters in the game and it doesn't accelerate back to high speed all that quickly. This is why the average MA stick flies the stick nearly in trans-sonic most of the time
, but its okay, people would find Ponies even more annoying if they were ubiquitous AND being flown well.