Gear hobbing

The recent thread about choosing gears for the drive train in a gear
hobber left me wondering. You can hob gears by driving the blank with
the hob itself. I just rented a video by Jose Rodriquez that shows how
to do it. There are also web sites showing hobbing with hob-driven
blanks. This technique seems to work well enough. What makes the
independently-driven blank process better enough to justify the highly
increased complexity?
Reply to
Bob Engelhardt
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