Precision versus volume in close defense

How useful is programmable 40 mm 3P ammunition for modern naval defense?

It is valuable on Type 31, but programmable rounds should be paired with enough barrels and rate of fire to saturate a last-ditch threat zone.

Programmable, pre-fragmented, proximity-fused ammunition gives 40 mm and 57 mm guns flexible effects against varied targets. Twin mounts are preferred in this assessment because a weapon facing an imminent missile must destroy it immediately and tolerate small aiming errors. The tradeoff is between precision engineering and the density of fire needed when failure means a mission kill or loss of the ship.