Geomancer

[Seraphor]

1. I mean, I wouldn't say the job fantasy of White Mage is the same as the job fantasy of Geomancer though, so you're not really winning any argument there. I wouldn't call a Druid the same thing as a Geomancer either, but White Mage is pretty divorced from the original Conjurer at this point in terms of aesthetics.

2. The real critical flaw with your argument is that you're ultimately making a subjective argument here. You see Conjurer and Geomancer as the same thing. I don't. WoW has Druid and Shaman for instance. To you those are the same thing. To Blizzard they're different. To others a myriad of different answers. FF has a number of jobs that some would say is the same as another, but others might say they're different. How you feel does not mean it's absolute. To me they do not represent the same "job fantasy" (which is a pointless distinction to me).

They're not the same, but they are similar, bordering on too similar.
Like Machinist and Corsair, or Warrior and Viking.

The games lore pretty much establishes that Geomancy/Onmyoji are the eastern equivalents of Conjury/Thaumaturgy.
They're not 'the same', but to use both Geomancy and Conjury as the base of similar jobs, both healers, would be redundant.

Which is why Geomancer would suit a Caster DPS much better, as they can differentiate it from Conjurer.