The most trust inspire duals.
So the more personal contact is important for the method - the more these IR should be useful.

Also when you tune to dual's personality and partly introject it, this improves the contact with own unconsciousness and this should reduce any neurotic symptoms. The human irrationally feels better and also consciousness may get useful ideas to rationalize and such stabilize this.

Such psychotherapy may remind more relations of friends than a medicine. Rogers developed in this direction. It may give positive medical results - what was needed.