Logic and biology aren't always synonymous in function. While I agree, your logic does present potential; there is no assurance. Where-as the current systems (and their successors, as they evolve) of cycles are proven, and if strictly adhered to, are safe. When you are dealing with the remainder of your life and the everyday functions of your natural biology, most people aren't exactly interested in being part of a ground-breaking decision, until there is scientific evidence and practical evidence. There is enough known risk in doing it the right way, why increase the risk to try another way?