When bigger warships stop being better

Is there a point at which bigger stops being better for a warship?

Yes. Infrastructure and sustainment impose hard limits, while cost and the need for multiple ships to provide presence can outweigh the benefits of concentrating capability in one hull.

More displacement can buy speed, armor, and firepower, but ports and support systems must still sustain the ship. Cost imposes another limit. One exceptionally large hull may provide less global presence than several smaller ships, a tradeoff illustrated by the changing scale of cruisers and battlecruisers around the First World War.