Why G3 and N3 break later battleship predictions

If the G3 and N3 classes were built, what would the later King George V class look like?

There is no defensible single design because the new ships would change treaties, rival construction, and several intervening generations of British capital ships.

A capital-ship counterfactual compounds over time because Italy, Japan, the United States, and Britain would all react to new ships and speed benchmarks. Italy might pursue the prestige of launching the first fast battleship even under severe financial strain. A 15-year gap allows several design generations, changing gun calibre, speed, armour, and even whether later ships are called battleships or battlecruisers. The construction cadence also changes which generation would be ordered in 1937, so the historical King George V is not a fixed destination. A later treaty might cap ships near 60,000 tons or accept 100,000-ton designs after an American Tillman-style escalation. Any distant prediction therefore depends on intermediate strategic and industrial assumptions.