it seems to me that physical therapy targets the symptom of the problem, while Egoscue addresses the root cause.

I'm a Canadian trained physiotherapist, and I must say, that I don't agree with this statement, but perhaps I'm the exception. I spent 37 years as a manual therapist, and that is all I did, search for the quiet culprit behind the noisy victims. Often that original problem area stiffens and becomes quiet, but the consequence of losing mobility in one area, is that compensatory strategies create all sorts of problems. I'm very happy for you that you found someone to hunt down those culprits, to work on realignment and correct faulty movement patterns. Brava!