I have been reading a lot on this subject and have come to the conclusion that the spring tine "dethatchers" on the market don't really dethatch, am I correct? Since the tines only penetrate 1/2" or so at the most, they barely even reach the thatch layer. They are useful for removing dead grass, leaves and other debris, fluffing up the lawn and scratching the surface to help over seeding. Is/are my "conclusion(s)" right? Joel B.