It works for everything, but paying 3mil an hour to do more damage isn't something most players will do for everything. You might run it for Aminon to boost your WS, but you're probably not going to run it the entire Sortie run every day. Most likely wouldn't use it for seg farm.
It's a huge buff for groups that can't clear V25s yet. It's definitely the most game breaking item released since Kraken Club, but it is still situational due to cost.
It has 1min recast, so you can easily just use it for every basement boss, not whole Sortie. Every Odyssey v25, Bumba KI1, Aminon, pretty much every fight where dps matters. for stuff that dps doesn't matter it simple doesn't matter.
I edited that last post, but it's not only +dps for many jobs, but opens completely new builds. It opens up much better TP sets with Malignance. Opens up Nyame path A. Opens Fast Blade II as meta option for many jobs. There is lots of use cases.