preface: I have never used a laser.
I have dry fired for practice, extensively. Perhaps I am misunderstanding you. Dry firing is used to perfect trigger manipulation. For dryfiring to be beneficial, you concentrate on the sights only. No target, a large, blank wall. Squeeze the trigger while maintain a perfect sight picture. If the sights move, stop manipulating the trigger.
With a laser you are anticipating where the bullets will impact. Not sure how that relates to dryfiring.