Endwalker is the most controversial expansion

[RyuDragnier]

Indeed, but you'd think someone would've said something once Solus greenlit again it later on. Midas and Nael were already lost causes at that point, but like... c'mon. One-off colony drop vs. laser that somehow does more damage than a colony drop and can be reused.

I'm going on the assumption it's because Bahamut's rage is not something easily controlled, not even by Ascians, so Emet-Selch knew that it was too much of a wild card. Meanwhile, just dropping Dalamud onto the realm, who will release Bahamut to cause massive destruction on a global scale for a Calamity, is likely a bit more controlled. The Ascians could just teleport into Dalamud, destroy his worshipers, and walk out, letting Bahamut run out of prayers and energy and dissipate when it was time to remove him.