Destroyer growth followed expanding operational demands. Ships had to stay with the fleet in rough weather, fight larger opponents, carry heavier guns and torpedoes, and support the crews and machinery behind those weapons. The escalation included replacing 12-pounder guns with 4-inch weapons and moving from 18-inch to 21-inch torpedoes. A gun-only or torpedo-only vessel might be cheaper, but a navy would need enough of each specialist to keep the right capability available. A larger generalist simplified readiness and could also handle independent patrols, guard-ship duty, and minor diplomacy.
Notable Point · 7:03-12:34
Why destroyers grew into seagoing generalists
The prewar design discussion connects larger hulls to rough-weather endurance, heavier weapons, crew support, and the practical value of one generalist over several specialists.