Here we go again...

Within 10 years the arranger will probably still have the same buttons/sliders/keys or whatever, but the contents will be quite different. Probably only O/S + mainboard, processers, ram and audio card.
All the rest will be software instead of hardware, which basicly means that your arranger keyboard changed from arranger to controller keyboard.

The reason is obvious. It's much cheaper so commercially very interesting.

Fred
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76