The modernized R-class battleship still had operational value despite her modest speed. Royal Oak had received stronger deck protection, twin four-inch anti-aircraft guns, pom-poms, improved directors, radio direction finding, and other changes that made her the most extensively modernized R class. The class's roughly 21-22-knot speed resulted from design and cost compromises rather than proving the ships had no remaining use. Those qualities could have strengthened Mediterranean, Arctic-convoy, or fleet-support operations even if she was not a first-rate fast battleship. Losing a capital ship narrowed the Royal Navy's choices for maintenance cycles and deployments. The death of experienced sailors and Rear Admiral Henry Blagrove imposed a separate loss of trained leadership.
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Why the loss of HMS Royal Oak mattered
Royal Oak was not merely an old battleship: modernization made her a useful capital ship, and her trained crew and flag officer were hard to replace.