Global logistics worked against Britain's 24.5-inch torpedo

Why did the Royal Navy not adopt the Nelson class's 24.5-inch torpedo across cruisers and destroyers?

The larger weapon imposed weight and stowage penalties, while 21-inch torpedoes were easier to carry and sustain on the far side of the world.

The 24.5-inch torpedo was developed for Nelson and Rodney, but its weight and volume made wider adoption unattractive. A ship could carry more 21-inch weapons in the same space and transport more replacements to distant bases. That mattered because the Royal Navy expected to fight Japan far from British industry, while the Japanese fleet operated nearer its own supply system. Weapon calibre was therefore inseparable from endurance and the geography of the intended war.