A launched hull can wait years for fitting out or funding

Why do incomplete warship hulls sometimes sit in yards or dry docks for years?

They may be waiting for the lengthy fitting-out stage, or the government may have paused the program and withheld funding for the next construction phase.

A hull is only one stage of warship construction. Fitting out machinery, weapons, sensors, accommodation, and services can take a long time after the main structure exists. A government can also pause work by declining to fund the next stage. Visible yard activity therefore does not mean a ship is close to entering service.