Looking at the job on paper: Geomancer has no buff to affect attack rate nor any kind of buff at all that provides any benefit in situations where attack and accuracy are capped. Geomancer can not switch parties to buff a whole alliance. Geomancer has to keep both itself and its Luopan alive to maintain two frontline buffs.

Unless something very unexpected makes the job useful, or efficiency isn't a concern, Geomancer's current place will probably be in the moghouse changing jobs.