What Ben does works because of his grip. If you dont have a stronger left hand, I agree with your view - forget it - but if you do, you can add some serious mass to impact with that angle, and that hip motion.
His move is based on a grip taken 'naturally' at impact fix. His impact fix, the way the left hand hangs down to align the left arm wedge, and the right arm wedge.
I don't debate the usefulness of describing a F/L/V left wrist for many, but some may benefit from looking at things from the left arm wedge. That is what Ben is doing IMO.
Not saying that is good/bad, the way to do it, just that is what I see in his move.
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