I'm well aware of the benefits, but how often do the motors run fast enough and long enough to have the full voltage applied?
The only time you'd see problems is during prolonged time at high speed, which even on a router, I'd doubt you'd sustain for long enough. But it's worth bearing in mind, that you could easily destroy a stepper motor very quickly by pushing too far.

Regardless, the point I was making, is before people go stating random figures and dismissing known good advice, understand the reasoning behind those figures and the advice. Just because something works for you, doesn't mean it'll work for others.