I consider the move Hallation to be more flawed than not. It's exciting, yes, but a real pain. If you can convince me this move has a rightful place in Zeal's move set, I'll agree that Chrono Trigger is perfect.
The Black Omen is a real painful way to end the game in general, really, but after fighting so hard to get to the end, I don't want to have everyone's HP taken to 1 every three turns! 8D