I agree some therapists are starting to come around on this, but even what you describe is somewhat flawed due to placebo effects, eg. some always feel better from any kind of talk, probably as a result of someone paying attention to their problems.
You might be able to overcome this effect by quantitatively tracking this across many sessions to some degree, but I think it's still always the patient that has to walk away, and never the therapist who says, "you're good, go on now".