Ok, so after explaining you had an optimal default strategy, you go on to explain you'd figured out an alternative strategy to beating a very hard boss then stating that you have to have an excellent strategy and have to execute it to beat the hardest boss.
So, apart from strategizing the entire game, it's really easy when you know what to do and have already worked out the strategy, or as you infer, have read someone else's strategy first?
Also, feel free to explain how ATB was more complex, because it wasn't.