"Don't really add anything to the party complexity?"
Well then, guys, go home. We only need one of every role. Don't like Black Mage? Tough, anything else doesn't really add much to the complexity of being a caster.
What do you mean you like Samurai? It's basically just a Dragoon with some Asian sprinkles! Just play Dragoon you goof!
Huh? Machinist? You mean not bard?
You like the concept of preventative healing over reactionary healing? Sounds like loser talk to me, Buster. Get that variety out of my face and go play White Mage.
Wait, so you mean to tell me that you don't like the flavor, playstyle, and general mechanics of Paladin and prefer the Warrior? Just play a DPS if you want mechanics, you silly bozo!
It turns out, people who play tanks actually want variety? I'm sure you'd be a bit upset if you weren't allowed to play Samurai and just told to play Dragoon or Monk instead because it didn't 'add anything to party complexity.'