Why did the destroyer-leader category fall out of use?
Short answerDestroyers grew until leader-level capabilities became standard, while the largest ships increasingly overlapped with small cruisers.
NotesThe separate destroyer-leader label declined as destroyers grew. Command and combat features once concentrated in a leader spread across increasingly capable standard ships. Most destroyers became capable of leading rather than needing a distinct companion type. At the upper end, their size and role also began to blur into the territory of small cruisers, making the old category less useful.