I do not agree to the "It's MSQ so it's casual content" point. No, it's MSQ and MSQ must have a Final Fantasy feeling. And the final boss of a Final Fantasy must be epic and quite hard. The difficulty of the fight is participating in the epicness of the situation.
SO I agree with the OP, do not change anything. The MSQ should be the best way to SE to learn to people (or to remind for those who forget / rush / and so on) how to play correctly and prepare them for the harder content.