How seakeeping helped Tribal-class crews and weapons

Was serious attention to seakeeping and crew fatigue mainly a postwar development?

Not entirely; Henderson treated the larger Tribal-class design as a way to improve seakeeping, gun stability, crew space, and retention before the war.

A viewer suggests that concern for seakeeping and crew fatigue was largely postwar, but Reginald Henderson provides an important earlier exception. Larger destroyers, especially the Tribal class, offered better seakeeping and a steadier platform for their guns. Their greater internal space also improved crew conditions. These qualities are linked to unusually low personnel turnover, which helped the ships develop and retain experienced teams.