a. Hand dependence – Most beginners use this approach “intuitively”, since their intuition (= unconscious patterns of behaviour) is untrained and therefore crap. This means that they think in terms of “this right hand note is played with this left hand note, then the right hand next two notes go alone, then the left hand next note is alone, then the next two notes in the RH and LH go together”. As you can tell straightaway, the moment you start thinking on these lines, the movements you so carefully trained are forgotten and replaced by other weird movements that the unconscious is coming up with due to the pressure. The playing becomes excruciatingly slow and a stuttering pattern of hesitations ingrains itself. The more repetitions the more this terrible playing becomes ingrained. Soon you cannot play any other way. Users of this approach (usually for ignorance of the proper way of joining hands), then go back to hands separate work, and find that they usually can do it well. They go back to hands together, and again everything falls apart. In some cases, after some months of this drudgery something clicks and they can actually play hands together passably well. This reinforces their belief that all you need is “more practice” both with hands separate and hands together. Most people however never get the “click”, the “knack” of playing hands together, except n the simplest rhythms and the easiest pieces: their repertory is forever limited.
b. Hand independence. As one becomes aware of the limitations of the above approach, one reasons (ah! Logic!) that surely the way to go is to have complete hand independence: if one hand does its job completely and regardless of the job being done by the other hand, and if both hands are right on time, the lines will come beautifully together.