Another point of view

With hardware boards the more polyphony you have the more the price jumps up, as you need more processing power and memory to accommodate it, therefore manufactures set the polyphony to suit the instrument and market, which with arrangers appears to be 128, workstations on the other hand have to have more due to more advanced layering being available compared to arrangers.

Roland tend to stick to this formula the same as the rest, which why most of their arrangers have 128 however the Ateliers (Organs) have 384 due to the advanced combinations they can have.

The question is?

Would you be prepared to pay a lot extra for your keyboard for something that would not be noticeable to most users? The answer from most players would probably be No, so there is no incentive for manufactures to change the formula.

Bill