Fisher's concern over losing old ships

Why did Jacky Fisher treat losses of old ships as a serious drain on the Grand Fleet?

He worried especially about losing trained crews, while his opposition to Gallipoli also shaped how strongly he framed the danger.

Old hulls still carried scarce trained personnel, so their loss could weaken the Grand Fleet beyond the material value of the ships themselves. Replacing experienced crews was a more serious concern for Jacky Fisher than writing off obsolete hardware. The immediate dispute also involved Gallipoli, an operation Fisher opposed. Fisher's rhetoric could change sharply depending on whether he supported the policy under discussion.