I already know the Doylist reason is that the devs slimmed down the healer offensive tools in the name of balance.

But I was having a conversation with a bunch of other people who INSIST that the Sixth Umbral Calamity somehow discouraged the use of water magic by conjurers at Stillglade Fane. I know this is inherently false because water is a regular element used by conjurers (even if it's not reflected in the playable toolkit nearly as much).

But why don't conjurers regularly use water for offense? We have Water, Water III, and Water IV spells used by enemies, so why doesn't say, Kan-E or Raya-O use them?