Think it might have been Jaxel who once stated moves should only have so many benefits stacked on, and for the most part im agreement, exception being moves that have a drawback to balance it out.
I understand fully how good Mitsu is, it is just my opinion that the gap between top and bottom tier should be much smaller. Even other games could aim to decrease the gap between the top and bottom tier some more. Mitsu to Amy is an appropriate gap. It is kind of a lot to hope for but it's not at all impossible. At the worst I could accept bottom tier being at Siegfried's level but I am hoping for better.