Did the continued use of turtleback bows show that destroyer hull design had stagnated?
Short answerNo. Bow shape followed the ship's role and hull-volume requirements, so a familiar form could remain useful.
NotesRepeated bow shapes alone do not prove that hull design had stagnated. A naval architect chooses the forward form in relation to the ship's intended use and the internal volume the design must provide. A turtleback bow can therefore remain appropriate across several generations even while machinery and weapons change. Other bow forms become preferable when a different role or volume distribution demands them. The useful comparison is between design requirements rather than silhouettes by themselves.