1. The point, that you seemed to miss, is that Geomancers being Healers does not somehow mean they can't be competent fighters. And it wasn't a one sided war of aggression, especially as Scholars, another Healer group, were part of it too. Unless you're arguing that it was just Black Mages against the world then clearly there was some degree of back and forth, regardless of how it started.

2. As far as NPCs working in different roles unless they're specifically a named race they don't tend to behave like a job anyways. So unless it's an X race Y class affair they aren't lining up.

3. Kyokuho says why. The knowledge died with his grandfather. Whatever Geomancy is, Kyukuho is only operating with a fraction of it. All the other Geomancers we see for the most part are charlatans too. Really this answers any possible changes too, because again, what Kyokuho does isn't the full job of Geomancy.

4. None of what I've said is Devil's Advocate. I'm not even saying you're saying they're the same, I'm saying I don't see them as similar. Or at least any more so than any other DoM job.