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Yellobello
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But to be honest the whole 1/256th microstepping thing is a bit over the top. As I already said, the motors can´t really reslove the half a million steps per revolution, the torque diminishes to almost nothing and when applied to 3D printing, even the differences from 1/16th to 1/32th microstepping in print quality are very hard to see, if at all. The motor noise however goes down a lot, but then again you can interpolate and have about the same results. Trinamic does this for a reason.
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The point is indeed not to have a higher resolution but to come close to a pure sine wave leading to a smoother rotation, less vibration, therefore less noise. I guess it is also the reason the driver can do interpolation, no need for the controller to issue all the intermediate pulses.