That's a cool piece of trivia. Love it!
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Black mage.... White mage.... Rage mage.... whatever. It's all branding/creativity, and in the end neither of those terms really describes completely what a 'conjuror' or a thaumaturge' actually is.
Since the typical dictionary definitions don't give too much on history, I'll list these wiki articles for quick reference :P
http://en.wikipedia.org/wiki/Conjuror
http://en.wikipedia.org/wiki/Thaumaturge
http://en.wikipedia.org/wiki/Magician_(paranormal)
The current in-game terms are quite accurate if not spot-on in their applications. There is no need for the dev team to spend days or weeks re-branding two entire classes just for the sake of referring to them in different (and less accurate) terms.
While the point of Jobs is to make them focus on a certain role, that does not necessarily mean that lore-wise they need to be shoehorned into one, strict archetype. A Black Mage can become more efficient in dealing damage through borrowing thaumaturgy and conjuring and creating a hybrid of sorts that still specializes in one role. This is emphasized by having two classes unlock the Job.
To be honest, I would be more concerned about the other Jobs. BLM and WHM seem to be the most straight-forward so far. MRD+GLD=>PLD or PGL(gambler)+???=>Monk are going to be tough nuts to pull off.
Just remember, 1.20 is revamping classes and 2.0's world may look at CNJ and THM in a different way lore wise. I am just waiting to see how this is executed before bringing logic in.
If SE decided the THMs would take the Elementals captive and force them to bend to their will, would you be happy then?
Seriously, you can complain all you want, thinking you understand the lore behind FFXIV MORE than the people who work there, but they have plans for all of this. Job abilities will change, and events will make the transition for CONs to become WHMs more clear.
If Black Mage to you is nothing but an ability set consisting of elemental spells, then you already have one. It's called Conjurer. If Black Mage is more of a persona or an idea to you, then the self-interested, destructive spell-equipped Thaumaturge is perfectly fine as a starting point.
I was on the fence. The OP convinced me. Good info.
All I can think for Paladin and Monk are that the Sacrarium, determining it needs some martial might, goes to the Pugilist and Gladiator guilds and offers to train their mightiest fighters in more spiritual ways. Both guilds seem like the types of guilds who would be willing to put up with some extra rules if it meant more power.
Marauders -> Warrior would simply be Limsa Lominsa trying to get a real, unified, solid army out of its ragtag pirate crews.
Lancer -> Dragoon would simply be the Dragoons of Ishgard coming down and teaching Gridania some ancient, previously-guarded secrets to fight against the Empire.
Archer -> Bard would... well be another exchange program, probably in Limsa. They seem like the kind of city who likes singing, considering their taverns (all 40 of them) are packed with drunk pirates looking for entertainment.