Some people have attachment styles that are problematic for them. The attachment style will be present in the therapy as well. Some choose to use that to work on that specific issue, trying to create a different way of relating that then can be brought into the person's everyday life. We all have attachment styles; it is even transcultural. But some choose not to make it part of what they want to pay attention to. For people who want to deal with how they relate to others, the way they relate to the therapist is like a training ground. This is only a simplest part of it, but I think it makes sense that people want certain things from the therapist and the therapist then decides whether those things should or should not be given, depending on approach and the client's needs and best interests.