The six-inch versus eight-inch cruiser question

Did wartime experience vindicate the Royal Navy's focus on rapid-fire six-inch cruisers?

Yes for British needs, but not because six-inch guns were inherently better; the useful calibre depends on the cruiser role a navy requires.

No simple calibre hierarchy applies. Both guns could be excellent, but the right choice depends on what a navy expects its cruisers to do. The Royal Navy's preference therefore followed its own anticipated tasks, illustrating how doctrine should drive weapon selection. Treating one calibre as universally right and the other as wrong erases the mission and force structure that made either choice sensible.