Jim.
I have the MZE on my Pat with the overdraw plate mainly for protection of my hand when using broad heads I also have some moleskin on the pick up arm to quiten the arrow on the draw.

I also had the MZE on my target bow but removed the over draw plate.
They both worked fine in the applications I had them.

The only reason I can think of for removing the plate is to cut down a little of the weight or to get the pick up arm closer to the riser.