How Fisher judged an obsolete warship

How did Admiral Fisher decide that a Royal Navy ship was obsolete and should be disposed of?

He trusted his judgment about wartime utility: if he could not see a viable role for the ship, he disposed of it.

Fisher relied on professional judgment rather than a mechanical age or tonnage rule. The decisive question was whether the ship still had a credible role in war. If he could not identify one, he regarded disposal as justified. This approach linked fleet modernization to expected employment rather than simply to the date on a ship's plans.