In the simulation genre, the gameplay and the realism is like two sides of a coin. They may often contradict each other, but in essence they are inseparable.
Aces High need not necessarily have to be this way. It could have always been something like Crimson Skies. Much more flashy, fast-paced, and acrade-fun - it could have used all sorts of alternative techniques of the latest fad and be based on space age - except, Aces High won't be this successful if it had been any of those.
Simulation is a recreation of reality.
Aircombat simulations in particular, gets it very existence from the fact that we crave a chance to experience something close to a real life conflict which most of us have never had the chance, and probably will never have a chance, to experience. It's the thrills, hardships, and bravery of the World War 2 pilots which inspires us, and thanks to computer technology all the grief and tragedy, deaths are left out of that equation.
Gameply aspects may defy, warp, or misrepresent reality in some cases, but its ultimate purpose is to strengthen realism.
Since there's no way to exactly replicate all of reality on our desktop computers, gameplay issues creates work-arounds and short cuts to let us experience realism more easily.
Thus, gameplay that contradicts, and ultimately harms the reality in essence, kills the game. In the long run it does more harm than it does good - that's why simulation games constantly strive to better its basic system so it could better represent reality.
When AH was small, none of the 'problems' surfaced in the manner as it does nowadays. HTC isn't God - they can't foresee all the results. Over time the basic system becomes outdated, flawed, and dysfunctional, because not all the inherent problems could be seen during the time of its implementation.
Things have changed now. Some people wouldn't give shi* on what happens to the game as long as they have somebody to shoot down, but a lot of others are feeling discontent in the fact that some of the basic systems are exploited or ill-used. There are things happening around that which in real life, would have almost never happened, and at a frequency that is alarming. The "gameyness" of dive bombing buffs or planes strafing ships dead is becoming the norm.
At this point, it becomes clear that more modificiations to the system are required to restore the tendency of air combat within acceptable levels of realism. Right now, the abnormalcy is off the charts.