Much easier aiming if its at the center (like no ""focal point""), and then the early ones also had only one, balance! But both uneducated guesses. focal point

Much easier aiming if its at the center (like no ""focal point""), and then the early ones also had only one, balance! But both uneducated guesses. focal point: not sure if its the right term here, what I mean is: If you put the guns far to the side and still let them shoot straight you have drastically reduced the chance to hit a plane flying in front. And if you point them inwards you have only one good distance (where bullets cross, like focal point) where you hit well.