The appeal of a quadruple 40 mm Bofors mount

Why did the United States Navy value quadruple 40 mm Bofors mounts?

Their rapid concentrated fire could destroy threats quickly, making prolonged firing less important.

A quadruple 40 mm mount can put enough fire into a target quickly that the need for a very long engagement may disappear. The remark is an extreme version of the wider argument for concentrating available firepower in the decisive moment. It links historic anti-aircraft practice to modern weapon-mounting choices.