Originally Posted by SystemicAnomaly
Good take on the issue. I agree that the passive/active argument could be a false/misleading dichotomy.
And I agree with you that the whole idea of "wrist snap" as commonly taught is misleading and can lead to players trying to do harmful things. Most of that snapping motion, like what you see on a Sampras serve video in slow motion, is what we perhaps incorrectly call "pronation" or is really internal shoulder rotation and not the snapping wrist flexion that is normally demonstrated.
I believe that most players should focus on the proper serve motion and little thought should be given the the wrist at all. Video is probably the best way to achieve this.