Dennis have u seen the Karma 3.0 video on motifator.com with the Motif XS/XF??? MUCH MUCH closer to arranger functionality now.
by the way - i have already produced some very detailed trance tracks with multiple arps and drum samples overlapping and have never once noticed any drop in Poly.
The 8 element voices has almost nothing to do with Poly unless u are playing organ voices. almost every other voice which may or may not have up to the full 8 elements dont actually trigger 8 notes in the one hit. they are all velocity or assignable button activated.
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Roland G70 / Roland BK9 / Roland GW8-L / Yamaha Motif XS / Technics KN6500