Is their merit to teaching some kind of open serve of some sort for a student who cannot serve with a proper motion?
If someone serves with a pancake sort of serve and cannot learn anything resembling a correct service motion, is their an argument to finding a way to improve their pancake serve to maximise their potential?
Case 1: for certain percentage of players who do pancake serves for life long so far and stay at usta 3.5 (some 4.0 level too), open serves may give them an options to do topspin serves without asking grip change.
Case 2: for players who have been doing topspin serves using continental grip but stop seeing any progress, open serves may let them release some muscle power from lower body (primarily the hip muscle). Except grip change, skill learned already for upper body movements are largely intact, not wasted. This is my case.
Case 3: Beginners can start with pancake serve with open grips, stay with open grip to learn topspin serve. I used to believe that in order to to topspin serves, I have to use continental grip. This is a common believe but it is a myth, not true. The video I posted to start this thread showed that open grip topspin serves can be done even without legs. Another thing worth to point out is that once you learn how to do topspin serve using one grip, transition it with another grip is pretty easy. It is true from #2 to #3, and also true from #3 to #2. The advantage of stay with open grip (for maybe 2-3 years) is to avoid the grip change barrier at the beginning stage of learning topspin serve. Once the topspin skill is learned, grip change barrier is not formidable anymore and pickup either #2 or #3 (or even #4) becomes just a personal preference.
Case 4: for advanced players looking for releasing under tapped muscle power.
Open serves have a long long way to go, since everybody is shaking head at it, not accept it as an option to serve at this point. Don't know when the wind will change somewhat toward
open.