Battleships as rare instruments of naval diplomacy

Why are battleships the least useful major warships in peacetime?

They are expensive to operate and must remain exceptional symbols, while cruisers and destroyers can perform routine diplomacy and presence missions more efficiently.

A battleship's peacetime functions are principally deterrent display and preparation for war. Its diplomatic effect depends partly on rarity, so sending one for every routine visit would make the symbol less exceptional. Large crews and operating costs also make frequent movement expensive. Cruisers can cover a broader ladder of presence, patrol, and diplomatic tasks with fewer resources, while destroyers are cheaper still. The comparison explains why the most powerful capital ship can also be the least flexible daily instrument.