Why the U.S. and Japan retained armored cruisers

Why did the United States and Japan keep armored cruisers longer than Britain?

They still needed the hulls for training and fleet duties, while Britain had enough newer cruisers and destroyers to replace them.

Old armoured cruisers remained useful while a navy still needed hulls for training and fleet duties. A navy keeps an old hull until enough newer ships can cover its work. Britain could discard armoured cruisers because it possessed many alternative cruisers and destroyers. The same technology can have different retirement dates in different fleets.