User blog comment:SuperStrawHatSaiyan/Are You Gonna Fix It, Toei?/@comment-34981281-20130107045624/@comment-2226235-20130108043923

It adds consistancy plus changing it arbitrarily would confuse the readers. Doing it after the timeskip shows how much Luffy has improved. When he does it now he never does it in his whole body except in the anime. Every time he uses it in the manga he just activates it in his arms or his legs so he doesn't need the stance.