Problem is aces high has full damage, and no damage.
Nothing in between, fairly light damage modeling with engine components, wires,fuel lines pully systems for control. In reality No one gets shot at with ANYTHING, and sticks around in that persons sights for long.
Try flying your damaged f4u, when the left aileron is none functional and just flapping in the wind, or even worse jammed in a not so good always keeping you rolling position. If ever we got these things, or more. EVERYTHING with aces high combat would change.
Imagine loosing lift, or added drag from a 20mm hole in your wing, your wing forever dipping, the constant correction.
With a flying machine, every bit of damage effected something.
Ask any pilot if he would mind someone taking pot shots at him with machine guns, you will most likely get a big "nuh uh, no thanks"

In short.no machine guns were really not that bad, aces highs damage model is, all or nothing at all. <3 HTC for everything