> most forms of professional therapy the therapist shouldn't say much at all

This is very untrue. Here is a list of psychotherapy modalities: https://en.wikipedia.org/wiki/List_of_psychotherapies. In most (almost every) modalities, the therapist provides an intervention and offers advice (by definition: guidance, recommendations).

There is Carl Rogers' client-centered therapy, non-directive supportive therapy, and that's it for low-intervention modalities off the top of my head. Two out of over a hundred. Hardly "most" at all.