Well, not to take over Mr Linemans thread and/or business; the issue is forestry mulching "clears the air, not the ground", as i heard someone say. So, yes, with all the roots and structure remaining, it does come back, and often fast, and thicker. What it does do, it allows you to access the area to do further work; such as routine mowing, spraying, dirt work, ect. It also is Far cheaper and faster to get in the area than root raking. Also, root raking and all that, cause a lot of soil disruption, and Can lead to erosion. Mulching, the roots and all keep the soil together, and the chips/debris actually cover the soil, also helping prevent erosion.