Should France have built more than one Jeanne d'Arc-class helicopter cruiser?
Short answerYes; three or four ships would turn an intermittent asset into a reliable operational capability.
NotesReadiness depends on how many major units a navy owns. One ship is a white elephant because its capability disappears during maintenance, while two improve availability without guaranteeing it. Three usually provide a dependable capability and four make it much easier to keep one deployed with another ready to relieve it. France would therefore gain far more from a class of Jeanne d'Arc-style helicopter cruisers than from a unique ship. The same logic explains why strategic submarine and carrier fleets are sized around rotation rather than ceremonial possession.