Old warships as imperial presence and invasion tonnage

Could the fleet undergo a Fisher-style pruning of its old warships?

Not in this campaign: a global empire still needs distributed presence ships, invasion tonnage, and older hulls that can absorb secondary combat demands.

A modern battle fleet still has reasons to retain older warships. A geographically dispersed empire needs permanent presence ships, while the campaign's invasion system rewards enough aggregate tonnage for major operations. Older hulls can also absorb secondary combat demands that would otherwise fall on newer vessels. The mechanics are game-specific, but they illustrate how a ship may remain useful after it becomes obsolete in the battle line.