Is There a Reason Why Conjruers and White Mages Don't Use Water Spells?

[Cleretic]

Water is the great eroder. If compressed and focused, it can cut through things with tremendous speed and power. Not to mention the displacement and area denial effects of triggering a flash flood on command with Water III. As shown by Leviathan, water can possess crushing force and be used as a powerful defensive tool, as his Veil of the Whorl can reflect cannonballs if his magic isn't disrupted by specialized tools. Even then, his head reflects arrows and guns while his tail reflects magic.

Well, a lot of that's either easily covered by what they can do (pretty sure a boulder can crush pretty hard), or of really specific need that's not really gonna come up in situations like short-warning combat (I don't think the cutting force of water is gonna do you a massive amount when a treant's bearing down on you). Water's defensive options are... honestly not something I completely buy on a physical level, but that's also literally what Aquaveil does (I don't play White Mage so I did forget that one, thanks Mikko). Aquaveil's really high-level, so maybe that's just really damn hard when you're not shortcutting the learning process with Blue Magic, and when they're literal healers it's probably just easier to patch things up afterwards if you can't get that right.

Despite not playing the job regularly, I have done its whole story fairly recently, and I can't think of a single situation where they were in a fight and water would've done more for them than just 'boulders and healing'. ...in fact, with a number of fights against animate trees and the like I can imagine water might've been a worse offensive option, if we assume that elemental weakensses and resistances still exist in-universe.