The Reasoning behind The Sundering? (*6.0 Endwalker Spoilers*)

[Absimiliard]

I will note that several retcons have occurred that have invalidated some parts of the Encyclopedia Eorzea. The Echo, for example, no longer works at all how it was previously described. It is not connected to Hydaelyn at this time. The blessing is something wholly separate and far more limited in distribution.

This being said, heroes are necessary. Any or all of those calamities could easily have been far worse had they not actively been opposed. This does not change the fact that she knew what had to happen. Also, I'd note that at no point did I imply she willingly let the calamities occur, which appears to be what you are reacting to. Venat does not seem to have the necessary strength of will to sit idly by while innumerable people die just so the world can get the outcome it needs.