BLU being able to insta-kill some of the bosses or essentially make them a joke with chain stunning has been a topic of discussion since they re-released the Yo-Kai event.
Off-topic, but god this community can be its own worst enemy sometimes. Noooooo, anything but cheesing FATEs! Not this horrible content we b**** about constantly! Wait your turn and make it the tedious grind it's supposed to be! Wait, why does Squeenix think we like doing FATEs the way they designed them? It's a mystery.