Does the Royal Navy need an ultra-long-range cruiser?

Why would the Royal Navy need an ultra-long-range cruiser?

It generally would not: overseas bases and port visits already supported its missions, so the same displacement was more useful in speed or armor.

The mission did not reward maximizing range at the expense of every other quality. British cruisers had to return for ammunition resupply and gun-barrel replacement even if their fuel endurance increased. Peacetime deployments also moved from port to port to display presence, while wartime operations used a dense imperial base network. Spending displacement on extreme range could therefore sacrifice speed or armor without creating a capability the Royal Navy actually lacked.