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regarding dry-firing and handgun accuracy:
if you come from a background of shooting longarms, the gun is supported and stabilized at 3 points, 2 of which at a fair distance from the motion of trigger pull. when firing a handgun and these points are reduced to fractions of inches, any little sympathetic movement of the small muscles of the hand in reaction to the motion of the trigger finger can move the sight off target. dryfiring can help to isolate the muscle movements and make them more independent. the fingers of the hand are used to working as a unit in most activities. as a result, it's really difficult to just move one finger without the others wanting to join in the act.
i'm just speaking from a viewpoint of accuracy, aside from the benefits of practicing tactical drills, regarding which i defer to those much more experienced than myself.
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