Goodpost goodpost.
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Standard Address:
-sets up for a Lagging Clubhead Takeaway....which gets you into the realm of Centrif. Force (which powers Swinging)
-more compatible with Standard Wrist Action (Startup and Release Swivel), which is more compatible with Horizontal Hinging.....which is more compatible with Swinging!
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Impact Address:
-adds structure, as Comdpa mentioned
-does not encourage Centrifugal Force (Hitters want none of this)
-sets you in your Impact Alignments (of the hands anyway...the body is still square)...allows you to feel them at Address....then you drive your hands back there
-sets the golfer for an Angle of Approach (Driving the RForearm to "right field")
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Hope that helps...
Ask if u have questions.