I agree there needs to be more ship content, however, I don't think that every Capital ship needs to have a full fleet.
For example, GG and the Seps don't really need anything else, they have 2 tanks between Sun Fac and HB, and plenty of damage between VD and Geo Spy, and there are only 5 non-capital separatist ships. Plus, Geo Soldier's ship really is left on the bench most of the time. Similarly, I don't feel like we should add a bunch of Galactic Republic ships to the game to make sure Mace has a full team.
Both FO and Resistance could use at least a tank, which could allow for some fun diversity in the ship meta (for GAC). But other than those 2, I think that most of the fleets are really finished, because nobody ever uses Mace, and you usually use either Thrawn or Tarkin.