To me all Darklight gear for Black Mage does is -1 inventory slot :/

As for primal weapons, I have yet to get any, only Garudas is good and I hear her drop rates aren't as bad as Ifrit or Moogles. Which is good and bad, good cause her weapons are better, but then warrants to why the hell are the other primal weapons harder to get since they aren't as optimal for damage.