Let's see... nine sliders on a G70 for all realtime part volumes, plus another eight for style volumes, plus sixteen for song volumes... Now, do you want reverb controls, too, and pan and chorus...? Best of luck finding the right fader in that maze...!
I LIKE the G70 system very much... Just enough sliders for controlling each section's needs, and four page buttons for choosing volume, pan chorus or reverb. You just have to learn which color (they are colored like Hammond drawbars) you need, and I never have a problem getting to the right one...
BTW, there is NO G70M, never will be, in all likelihood.
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An arranger is just a tool. What matters is what you build with it..!