What’s wrong with using the short arm approach to guitar playing?
Generally, if you’re using a fulcrum like the teeter-totter (short arm) you’re working weight one way and then the other. In other words, while resting between the wrist and elbow, the elbow acts like the bigger child on the teeter-totter, thereby lifting the hand off the strings (in a relaxed position). This is especially true if your fulcrum is midway between your wrist and elbow. In this position, one is holding tension in the shoulder, triceps, and biceps (just to counter act the teeter-totter like effect of this fulcrum) to maintain hand position on the strings.
