I've tried to stay out of this thread because it seems to me like arguing how many angels can dance on the head of a pin. But the above quote just baffles me. What art that teaches kicks does not teach and require its practitioners to kick with speed and strength and always try to kick faster and harder? And teach places to kick that will take out a leg (granted, probably at higher belts)?
To remove any out about "regular basis," perhaps you should define that. If you say a professional fighter cannot do that regularly when he wants to in different fights (different because he shouldn't have to do that many times in the same fight), he needs practice and may not be ready for professional fighting. If you say he cannot do that regularly in the same fight, again, he needs practice and may not be ready for professional fighting.
If course it is a bit of a moot point since in professional fighting there are rules to prevent injuries that would prevent opponents from continuing professional fighting. I'm not sure where we got off on this thread being about only professional fighting. Regardless, move your angels over. Mine can beat yours.