Radio end points & the MMM???

[RBMike]

I've heard/read repeatedly that we should not turn down our throttle end point on our transmitters to limit the top power of our MMM set-ups. I would like to know why (technical) from Patrick (or other qualified person). The reason I ask is I've seen guys doing this with no problems but I've also seen guys loose the MMM while doing this. Besides buying a lower KV motor, is there another way to do it. Inside the MMM you can change the throttle curve but not the high end point.
Thanks