Why a Japanese destroyer gun had to work beyond night battles

Was a fast-traversing 3.9-inch gun ideal for Japanese destroyers because they expected night battles?

It suited night fighting, but a destroyer's armament also had to work when the enemy or circumstances imposed a different engagement.

A fast-traversing 3.9-inch gun could serve Japanese destroyers well in night actions. At those ranges, its rate of fire would matter more than long-range performance. A ship's designer cannot guarantee that every engagement will occur at night. The armament must therefore work when the ship faces unfavorable conditions as well as in its preferred kind of battle.