Why Japan standardised cruiser machinery earlier

Why did Japan standardise cruiser power plants earlier than several other navies?

Japan pursued evolutionary development and moved onto a war footing earlier, while other navies were still experimenting or planning for conflicts expected much later.

Japan reused common boiler and turbine arrangements through evolutionary development, while Britain and the United States continued successive experiments. Britain's Ten Year Rule restrained construction until 1932, and several navies planned around wars expected in the 1940s instead of immediate mobilisation. Japan's expanding war in China put it on a practical war footing much earlier. That timing encouraged repeatable machinery and incremental improvement instead of waiting for a later generation of ships.