thats because people dont know how to strike, kick or kiai for that matter.
when you strike properly you only need a few inches to gain enough power, that coupled with the fact that there suppose to coincide with kyoshu points, to add to there effectiveness, and again they dont teach how to activate the points in his style of kempo
edit
rapid fire does not mean no power it means speed.
you can still do this with both power and speed in less techniques and just as fast
when you strike properly you only need a few inches to gain enough power, that coupled with the fact that there suppose to coincide with kyoshu points, to add to there effectiveness, and again they dont teach how to activate the points in his style of kempo
edit
rapid fire does not mean no power it means speed.
you can still do this with both power and speed in less techniques and just as fast