On Science Blog I read this: "In well-intentioned efforts to establish relationships, some physicians tell patients about their own family members, health problems, travel experiences and political beliefs. While such disclosures seem an important way to build a personal connection, a University of Rochester School of Medicine and Dentistry investigation of secretly-recorded first-time patient visits to experienced primary care physicians has found these personal disclosures have no demonstrable benefits and may even disrupt the flow of important patient information." I think exactly the same goes for most other kinds of helpers like: coaches, therapists, constultants, and mediators. Focus on the client and leave your own views and experiences out of the picture. The solution-focused approach has emphasized this all along.
Related: Client directedness