Here's what this situation needs: a blender with a tachometer!
I agree with Andy. For most blender applications, I have to imagine, there'd be little difference between "whipped", "pureed", and "frapped" foodstuffs. For that matter, I'd find it hard to imagine there are any industry standards on the subject!
One other bonus I could see of a variable speed blender is "soft starting" the motor at a low speed and walking it up to high speed. This process, as I understand it, it said to increase the life of the motor and the motor mounts by reducing start-up torque and electrodynamic stress on the electronic components. This comes from router marketing and not blender science, so individual fates may vary, of course.