Oh, I can find legitimate uses for more than 10 steppers. Let's see...a Sextupteron with full color printing (I assume you would want at least 4 colors to get a decent spectrum.) and a gripper for assembly. I am sure I can come up with some other examples that are more practical but the point is that design is similar to a gas. It will fill up the space it is given. If it is super cheap to drive 12 steppers then you will probably see designs that use 12 steppers.
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