Why veteran personnel mattered more than replacement hulls

Why did losing commanders and experienced crews with major warships have consequences beyond losing the ships themselves?

Ships could eventually be rebuilt, but navies could not quickly recreate decades of command, maintenance, damage-control, and training experience.

Wartime accounts often overvalue hull losses and understate the destruction of accumulated human experience. Courageous and Glorious took two prewar carrier complements of maintainers and fitters down with them. Those specialists would otherwise have formed the nuclei of new air groups, just as surviving U-boat veterans could have trained later crews. A replacement hull might take years, but a navy could not manufacture thirty years of judgment in the same period.