The Royal Navy continued building 64-gun ships while it was already building 74s. Their smaller size made them easier to support on long voyages, and their established service record gave the navy confidence in them. They were often preferred for Baltic and distant deployments when a suitable ship was available, although 74s could also serve there. The growth of supporting infrastructure gradually reduced that advantage. Inflexible was the second-to-last British 64-gun class, followed by the Crown class.
Chapter · 2:00-5:00
Why the Royal Navy still valued 64-gun ships
Easier support and longer range made 64-gun third rates attractive for distant service even as the Royal Navy built 74s.