Well, obviously we will not pinpoint a root cause here and produce a nice academic paper. It is not how I meant it.
I mean that exchanging knowlede, ideas and coping strategies really makes a difference for a MS patient, specially when compared to such a patient's situation in say 80s. And I am sure this difference in many cases is measurable on EDSS. Even if Terry Wahls would be possible in 80s I am sure her audience would be much, much smaller then today. And her ideas made a difference for me (dairy out!) and for many others. Lowering sat fat intake was already there in 80s, but without internet I doubt I would know about it and it is helpful for me as well.
Moreover, I wouldn't underestimate the power of a community of thousands of desperate people sharing same problem.
BTW, what I just did in this post is leaving a reinforcement, positive trail, feedback for leaving out dairy and looking into TW or Jelinek/Swank approaches. That information might make a difference for other readers and encourage some of them to try it. Leaving positive feedback for strategies that work for patients resembles a little bit these "ant optimization algorithms" which is an interesting problem solving technique. Ok, I just want to say something more is going on than passive reading