My mistake, most people aren't familiar with the concept of syntonics. The therapy I did actually isn't the same as syntonics, but to lump the two together wouldn't be any great injustice. They are founded on very similar philosophies.

As far as the rest of your points are concerned, we're just going to have to agree to disagree. The effects I experienced from craniosacral work were not slow developing and nebulous, they were immediate and unmistakable. For me, there was no "I wonder if this is working" with craniosacral work. It couldn't have been more obvious.

This was my experience. I would not expect that everyone with PCS would have the exact same experience, but I would expect that some people with PCS would have a similar experience, so I would recommend at least trying it to people who are looking for therapies that might aid or expedite their healing process. Did craniosacral work completely resolve every bad thing going on in my body? No, but it exorcised a big fat chunk of them. For that, I'm extremely grateful.