An enemy plane is not exactly a fragile object, so you need to get more than a few bullets on target to be assured of the kill. The shooter and target are almo

An enemy plane is not exactly a fragile object, so you need to get more than a few bullets on target to be assured of the kill. The shooter and target are almost never going to be on exactly the same vector and you need to lead your shot because both the shooter and target are moving at several hundred miles an hour. This means that for the fraction of a second where the shooter's bullets cross the path of the target the shooter needs as many bullets as possible on target -- therefore it is better to set up aiming so that all guns are on target briefly than for many guns to each, individually, have a target point and to effectively 'spray and pray' that you get multiple hits on the target.