i think the point is that soil is more natural and for a plant to be in hydro its entire life and being a mother plant never actually being harvested and what not it needs to live like a real plant would. Hydro is better for one cycle, but i think after a couple cycles it needs the "the real thing". In order to function properly. just a theory i dont even have a mum(no room). Seems like an ok theory. just my .02