Underrstanding Endwalker white-mage -

[Semirhage]

That kind of healing power saves life’s sometimes.

...How? Parties make mistakes, yes. They stand in things they shouldn't. Goes without saying. None of this changes the fact that AOE damage in this game is so infrequent that Thin Air Plenary Cure 3 spamming is never, never necessary. There is one single phase in UWU where I've come close, and I still cast Stones between those Cure 3 casts. Scenarios where a group of people take damage back to back so fast that they require Cure 3 spamming by accident don't exist.