This topic is something that I feel very strongly about (which I think is pretty obvious). 85% of my time working out is spent on basics; I don't mean acting as a robot doing kicks and punches for the sake of doing them. Repetition has value, but only if the move that is being repeated is correct in form. I have noticed that when some people work basics they are working incorrect form, developing bad habits. I believe it is not enough for an instructor to simply show the proper way to execute a kick, punch or block, and make the occasional comment about form. Each person must be conscious of their own body mechanics, checking for accuracy of form as well as consistency.
For example: When executing a front ball kick (front snap kick) against a visible and tangible target we all know if we don't strike with the ball of the foot you will injure your toes. However when executing the same kick to an imaginary target, or "in the air", are you making sure that your foot is in the correct position to strike with the ball of your foot?
After a while some of these things will become automatic, muscle memory will come into play and you will execute proper form.
One thing that has helped me when working on basics is when I am doing strikes and blocks "in the air" I visualize a target, something hard, like a bag or person. This helps improve hand/foot eye coordination as well as keeping proper form.
I have found that when working with people completely knew to martial arts, this has to be explained to them. I noticed this when watching a new student work on Kicking Set 1. Against a bag or shield his kicks were perfect form, but in the air the kicks became sloppy. His mind had no focus to where his feet were going and the purpose of the movement was. After pointing this out to him, telling him to visualize a target, his kicks improved greatly.
I believe that part of the problem with basics is that we see them as purely physical exercises, something the body does with very little conscious effort from the mind. After a certain amount of time this is true, our body recognizes the positions it is supposed to take. But teaching the body to do that takes a conscious effort.
Just some more thoughts :deadhorse
-Josh-