Why aren't more vessels playable in the campaigns?

[agwilt]

I don't really mean this as a bug report or complaint, but more of a question (in particular I'd like to be able to play RN submarines in the 1968 and 2000 campaigns, as well as surface ships in the RN 1984 campaign).

Is this a deliberate design choice, an oversight, or are there technical difficulties in supporting more vessels in campaigns?

[HobbitJack]

Vessels are made playable in campaigns as they are deemed to be ready, or a good fit for those campaigns. Future versions of the mod will include more playable vessels in different campaigns as they are deemed to be ready and/or a good fit for our various campaigns.