Night fighting reinforced the six-inch choice

How did the Royal Navy's emphasis on night fighting affect the shift from eight-inch to six-inch cruisers?

Night actions were expected at shorter ranges, where the eight-inch range advantage mattered less and rapid six-inch fire mattered more.

British night-fighting doctrine rested on the same practical range calculation used elsewhere in the lecture. At short range, even after radar arrived, firing more shells quickly could matter more than possessing the eight-inch gun's extreme reach. This made the six-inch cruiser a natural fit for the Royal Navy's anticipated engagements.