The "zoom" is not the problem. Zoom simulates what you would actually see in terms of size at the cost of field of view, where as the "normal" view is made smaller so you can see a more normal field of view.
Pilots may want to conserve ammo, but they also want to live longer. If they could fire on, hit, and kill unsuspecting targets from their 6 at 1000+ yards, they would have done so. Getting in close enough to hit risks getting spotted, which means having to shoot at a maneuvering target, which means a chance of dying in a dogfight. The whole goal of BVR missiles is to achieve this result.
I know HTC incorporates every bit of documented data they can. But real world engagement limitations (whatever their cause) prevent 1000 yard hits and kills or make them extremely rare. Whereas in AH, they are common. I presently can win several dogfights per 2 or 3 hour session using long range firing tactics. I have only flown about once a week or less for the past several months, so I am very rusty. It is not that I have any skill, it is that the ballistics are that easy.
I have fired a lot of rounds at rifle ranges. I have fired on targets at 500 yards with M-16 and M-14 rifles. To consistently hit a target at that range at all using single shots, you have to lay down prone, control your breathing, and pull the trigger very carefully. Even with a tripod, fully automatic fire will not even come close to this accuracy. An aircraft does not have anywhere near the stability and precision of a rifleman laying prone firing single shots.
Curiously enough, IL-2 has a much more difficult gunnery model despite being based on pretty much the same physical data as AH. I am curious as to what they did differently to make it harder to hit. Did they just throw in some random fudge factor to enhance gameplay? Or have they modeled something more realistically? Who knows?