They aren't at all. The stomp is to make things LOOK more violent and impactful through the large and aggressive MOVEMENTS. The noise from the stomp isn't and never has meant to be mistaken for the sound of a strike landing, unlike thigh slaps. You don't want or need to hide with stomps and striking as the "trick" is to create a more intense moment through action and noise, but again, NOT to fool you into believing the sound IS the impact.