I wouldn't know if these phases are relevant to me because I've had ME/CFS most of my adult life and it shares many of the symptoms of [...] damage. I don't expect to ever recover from it, unless they find a cause and cure. My illness predates my former xanax use by more than a decade, but then I also acquired a number of conditions after starting xanax. eg; idopathic poynneuropathy, chronic tinnitus, POTS. If those conditions ever resolve, or even improve, I might be able to attribute them to [...] damage and put myself into one of these phases.
One thing that has definitely improved is my memory and cognition and that began about mid way through my taper. I guess I'll have to wait a year and look back to see if anything changed.