100%, of course, does not happen. Not because the approach is bad or the specialist is not trained. The main condition is cooperation with specialists and the implementation of their recommendations.
The problem is that often people are waiting for the "magic pill". While working with the psyche and working through difficult life situations is, first of all, the work of the person himself, and the therapist only accompanies in this process. Therefore, if a person cannot be persuaded to work, then a great result cannot be expected.