I've noticed a couple of times this dislike of dancing in patterns here in the forums. (Most recently in the thread jealously and competition.) Of course, I agree that a good leader should be able to improvise depending on the response of the follower and the music. However, think back to when you were a beginner yourself. If I recall how it went for me: initiating a simple enchufla or single right spin required that I danced the basic step for several bars until I remembered at how to give the right signal at the right count. (Actually, that still happens to me whenever I learn something new.) By learning choreographed patterns, one gets examples of which moves connect nicely and one conditions the brain to do make these connections without concious thinking. I don't think a normal person can improvise non-choreographed connections before having "automated" them by memorizing patterns.