The tale of the Stick and Knife
When we look at conventional Martial Arts we can compare or liken it to a stick. We say that as the Martial Artist works to develop strong body and body actions to strike or kick with speed (velocity), power and distance. All the same qualities as striking someone with a stick; the speed or velocity of the strike maximizes damage and contact are as it does. The area for targeting is general such as arm, head, body or leg... these however are provide a protection by nature and although devastating with the power, it is not efficient nor the best approach.
This is good for those that are young and strong and have many hours to train in becoming more so... but is this not a failing proposition? You need the youth and training to maximize but the ageing process at some point diminishes the out put level and a younger and stronger individual now has the advantage.
We then compare it to Kyusho which is more like a knife as it penetrates the surface to seek out the vital underlying targets. With the knife, massive speed and power are not as critical as it is with a stick as the finely honed edge and point are enough to get past the natural protections of the human body.
Transitional response is far slower and more cumbersome with a stick as the power from velocity is needed and proper distance is needed. As example say you make a forehand strike and need to transition to a backhand, this will take greater strength and only ever deliver a fraction of the power or potential as the forehand, targets and incapacitating potential is severely diminished.
The knife can choose a direction far faster and in greater range of angles and possible targets... and all with effortless transition with the same level of incapacitating potential.
Adaptability with a stick is constrained as there is one basic grip whereas the knife is equally potent with either grip. There may be argument from some, but let's face it if you hold a stick in a backhand position, there will be little power, highly constrained mobility, transition and therefore worth.
Size does matter. Look at this realistically, it you have a 6 inch stick what real worth is it in comparison with a six inch knife? The shorter stick will demand even greater velocity and power to create a benefit, whereas even a one inch blade can still inflict far more potential in greater directional and held positions.
There are more comparisons that can be drawn, but it is not necessary to the logical mind... a weapon that only has value with speed and power (that has a short life span) will be far less worthy of time due to the lesser efficient model that can improve far longer and with the same potential.
We are not trying to say Martial Arts are crap, we are just pointing out that if you use a knife (Kyusho) as opposed to a stick (conventional striking), you are greatly increasing the amount of YOUR potential, for effort expended.