Thing is, you essentially only ever make three choices in XIII. Heal, tank, and attack. That's it. And it's generally obvious which is required and when. You might die once or twice when a new job is introduced or you meet the odd boss with a pattern you need to figure out, but such times are incredibly infrequent. I could probably count the number of times on one hand. And usually when you learn the pattern that caught you off guard once the way to counter it and timing required is obvious. An obvious optimal decision isn't really a decision.