For both World Wars the Royal navy was on paper the best in the world.
Yet in both despite the massive resources it had it barely met it's obligations.
My question to those who know about naval matters why was the Royal Navy so ineffective in both world wars given the inferiority of it's opponents?
Obviously the First World War is the most obvious as there was fleet battles that the Royal Navy was built to fight yet did not win decisively.
The RN was very effective in WW1 (it got the job done), it was just resource inefficient. It had twice the size of Germany, yet managed only to achieve a stalemate in the North Sea. The UK was no more able to attack the German coast than vice versa. It was geography that saved the RN on this one. Gallipoli was a blunder. And the U-boats were badly handled. In WW1, the RN resembled the stereotype of the Russian/Soviet Army. Average quality units applied in overwhelming numbers where losses can simply be absorbed.
The failings largely have to do with the RN falling in love with big glorious ships, its own traditions, and decisive sea battles. It forgot that its first role was to protect the sea lanes for trade with the British Isles. Winning the sea battles is a way to achieve protection of the sea lanes in many cases. It is an means to an end. Not the end.
As to the PoW and Repulse, it was a simple intelligence failure. The Admiral believe he was out of effective range of land based airpower when he was sunk. The Japanese had spent 6 months working with lean fuel mixtures and other gimmicks to extend the range of their planes. They had been intensely training to improve their land base naval aviation.
In WW2, the RN repeats the pattern of having an average quality Navy, but winning against much smaller German and Italian Navies and being driven from the field by the Japanese Navy. The RN just traded surface ships lost with the Germans, they out fought the Italians, and they were outfought by the Japanese.