An excellent question Danny. IMO, a 'true' swinger allows CF to help keep exensor action back and through. I too often find that applying extensor action when swinging 'can' hinder the flow of CF, but the trick is to apply just enough to keep the structure without getting in the way of CF.
Certainly when hitting I personally feel and use extensor action to a greater degree, or at least that is the feel. In both cases someone watching probably wouldn't see a difference. That said - extensor action is absolutely important - and most people do not have enough.
I dunno if any beneficial CF is present on the backswing.
When you mention the structure wrt EA, is there a clear indicator of lack of EA? Where in the structure is the breakdown most obvious?
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