Nick, or Rainer,
I think your question is, "why is the NSR manual so much better than other forms of meditation instruction that I have seen?"
A simple answer might be, "because NSR is based on better knowledge and better understanding of how the mind and body acquire and release stress than other books you may have read."
Your question about synchronizing thinking the mantra with breathing has a simple answer, "because being concerned with breathing, or other aspects of the body, is not as simple, natural, or efficient as NSR Meditation."
As another example, meditating while simultaneously swimming, or solving nonlinear differential equations, would be more complex than simply transcending, that is, following a thought to the source of all thoughts. Therefore, it would be less efficient. In fact, one might not be able to transcend at all under such conditions!
Feel free to ask any follow-up questions.
David Spector
NSR Meditation/USA |