Transference is positive and essential in therapy. The existence of a positive transference from early childhood to the therapist (or other figures) is the glue which allows the relationship to develop. Without transference there can not be first willingness to trust and this is an essential element.
The existence of negative transference and the problems of how deeply one can be distorted by past experiences is the work of therapy.
To be able to see and experience life realistically is the goal of good therapy.
Understanding what is distorted and unrealistic in the current transference is the work of therapy.