Did Britain need US naval support at the start of World War I?
Short answerIt was not essential and added multinational-command complexity, but newer American ships could release older British units for useful work in secondary theaters.
NotesThe Royal Navy could fight without early American help, so the question is whether reinforcement justifies a more complicated command structure. Britain would still find useful assignments for the ships. Modern American units could replace older British vessels in home waters and release pre-dreadnoughts or other hulls for the Channel or Mediterranean. The payoff is a logistics and allocation gain across the whole fleet rather than a simple requirement for more guns at Jutland.