IDK if this is the correct answer but, I don't think it matters.
However, it could be paint color dependent to avoid that swirling effect on darker colors.
Many prefer long strokes when applying & removing(vertical or horizontal) and has been one school of thought in order to avoid that swirling effect(into the paint surface) from pressure when applying by hand.
I for one, prefer to do long strokes, e.g.,
*From the windshield toward the front fascia.
*Or on the trunk, from tail light to tail light.
*On the roof, from front windshield toward the rear.
*And long horizontal strokes down the sides of the vehicle.
Many folks apply & remove in a circular motion with fine results(color dependent).