true, and it is a relatively simple technique, which is prolly why kakashi was able to develop it easy enough. but like lee and gai were saying, only sharingan (and possibly byakugan) users could ever use the move effectively, since it requires a head-on dash to the enemy that leaves the person wide open to counters if he doesnt possess the eye ability to see it coming.....

therefore, you wouldnt see any character that doesnt possess an eye ability like sharingan ever using chidori