We need an Eastern themed caster

[Iscah]

Kyokuho practices Doman geomancy. Hingan geomancy is a bunch of charlatans spouting superstition to get people to pay them for consulting.

I don't recall them ever making such a distinction. Kyokuho's explanation in the level 65 quest seems to indicate that the charlatans are directly mimicking Kyokuho's grandfather's discipline for profit, not that they were a separate pre-existing one.

In any case, my core point remains that just because we've seen one school of geomancy doesn't mean there can't be others, and also that despite any talk about successful merging of astro-geomancy into a single concept, our practical AST skills have little to show for it besides perhaps Earthly Star, which we learn well before the Stormblood questline concludes.

So, if AST remains strictly astrological despite its lore-ties to geomancy, then the opposite can also be true.