There's for sure more power and speed with opening up the shoulder to free it for a higher backswing - but it comes at a cost which is control. Just like in Golf, the more "wind" you give to your body on the backswing, the more power you generate as the club is released - but the harder it is to hit the ball...because your gross muscle movement is greater and coming back into alignment is harder.
I can swing like that, and generate a lot of speed and revs, but my control is nowhere near a more traditional approach. Plus, you're putting more pressure on wrists and forearms to generate that in/out swing...and it can be harder on your tendons.
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