Reserve strength buys time to improve wartime designs

The M class entered production using pre-war thinking, while subsequent ships reflected lessons from the developing war. An existing force approaching 300 destroyers gave Britain room to revise its approach before committing further production. Reserves can appear inefficient when measured only by cost, yet provide time to assess a crisis. Stocks and sufficient force strength allow an organisation to absorb losses while considering its response. Preparation gives more time to understand the operational problem before committing to a response.