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[Archwizard]

I am simply saying Geomancers could be a healer.

Cool! Great! That's your full thought! And others are saying Geomancers could be DPS! Necromancer could be a healer too! Chemist could be a ranged DPS job! DRK or GNB could have been melee and NIN or SAM could have been tanks!
Okay! Appreciated! You've made your point, we all clap and move on.
If the only thing you wanted to say is "It could be a healer", you wouldn't feel the need to argue with the people who expect or want to see it implemented as a DPS.

The big argument against it being a healer -- and it's a pretty strong one -- is that it would be pretty close to CNJ aesthetically, and is a headscratcher on what it could bring to the table that WHM doesn't already have or has already lost for being too powerful (hi Stoneskin). If you had a point about it potentially being a healer, you would argue for what it could bring to the table, instead of simply trying to contradict the people who point out its greater potential as a DPS.

We have a lot of "could be" arguments available for many job candidates! It's also pointless to throw that out there and argue like it's the only solution, especially when you proceed to act like you legitimately don't care which of the two it is, how it's implemented, or even if it is implemented at all.

Can it be implemented as a healer? Fine, sure, yes. A lot of people would be disappointed, but okay, it can be. Probably won't be, and we'd much rather see it fleshed out and being unique.

So saying we need a Water mage is pretty pointless as a distinction again.

Nobody said we "need" a Water mage. Nobody is saying it's vital that Water be represented. Nobody is saying "stop production on any caster that doesn't have Water magic" or "force feed some Water magic to a job that doesn't normally use it."
OP just asked to see some Water rep in the future, if possible. That's it.

I'm not really the one arguing that we need a Water rep, so it's kind of a moot argument to pin on me.

I wasn't pinning it on you. I'm saying that you use nonsense and petty arguments against it as if Water mages stole your lunch money.

The Sai Taisui seem to be some sort of non-human entity, and I'm disinclined to really place much stock in what that means.

The Swallow's Compass is a giant shrine built by Doman Geomancers, occupied by beings who hold exactly the spirit-subjugating powers that the ancient Geomancers are said to have used. Regardless of what the Sai Taisui are, it is an architectural representation of how Geomancy is more than just what we've seen with Kyokuho.
And as BasicBlake said above, they were created by and infused with the power of Geomancy anyway. It's not the first time we've seen magical constructs use the same powers as their creators; you fight a Mhachi golem that tosses out black magic in the BLM storyline, and a Kuribu statue with white magic in one of the Amdapor dungeons.

I mean, if they really wanted to just give Kyokuho a Conjurer moveset they could have done that. He does have a different healing spell.

They did give him a Conjurer moveset. All they did was rename the spells.

To say they did more than that is at best flavor, and at worst reading into it.

There isn't really a good reason to change it from just Conjurer if they aren't going to use it as a hint at things.

Again... Alisaie wielded an aether sword and fought like a Gladiator. There are Onmyoji NPCs who fight like Thaumaturges.

Look, if they wanted to use it as a "hint" like you say, that would mean they would have had to design the job already so they could use some of its spells as samples. But then they may as well have just implemented the job.
It's more likely that what we see with Kyokuho is what we would call a "placeholder".
Considering the exact spells he uses have no impact on the story so it wouldn't be a retcon to change them, the only thing keeping the devs from going back and giving him a more faithful moveset should they introduce a full GEO job is laziness. We already have enough NPCs running around with dummied-out versions of spells specifically because they don't care what NPCs have in relation to what players keep. Let's be honest, even if they do introduce GEO as a job, they will probably say we practice a different form than Kyokuho has, much like how Sharlayan Astromancy is different from Ishgard's, or our soul crystals give us access to ancient spells lost to time -- expressly for the purpose of not having to go back and recode him.

Geomancy was written as part of the religion, folklore, history and architecture of Othard and Hingashi, so we would inevitably be introduced to some Geomancer NPCs at some point -- it would have been more suspicious not to have. They call Kyokuho a Geomancer because he is, within the lore, a Geomancer and not a Conjurer; they coded him as a Conjurer because, in terms of gameplay, they didn't have a Geomancer set already and Conjurer's moves were the closest to what they had in mind. It's not that complicated.