That’s the debate right - do you need all of those extra movements to generate the same distance?
take a look at
skip to around 6:50 in - lpga pro has less arm speed but generates more head speed because of lag. You can move your arms slower and hit the ball further. There are other variables too - like optimal shaft flex not discussed in this video (or anywhere.)
We’re speculating, it would be interesting to see some A/B comparisons with data/videos.
Jim can’t provide a good A/B comparison because we need to see results of a scratch golfer who uses the traditional swing vs the JV swing. Who cares what club head speed he can generate, it would be good to know now much more/less speed is generated with the different swings.
If it was tour quality, it would be on the tour. From what it have seen, it don’t think it would be any more accurate than other swings. A 3/4 length backswing would produce at least the same power and be as accurate.
I would not teach this method to my kid either.