I can see that if collaboration works well then it can be a very good thing with providers sharing information in a way that benefits the patient.

I have had a bad experience with collaboration. I had a mysterious illness for several years (the mystery has since been solved) and collaboration between my doctors meant that two or more of them concluded that I was crazy and that there was nothing really wrong with me (there was). That diagnosis of malingering was put into my medical record for everyone to observe, and I had a hard time after that finding a physician to take me seriously.

My educational background is such that I can understand any illness or treatment in virtually as great a level of detail as a physician.

All of this makes me very wary of being managed by doctors and other providers who hold conversations about me in my absence. The connection of therapist, with whom I will share some pretty private stuff, to physician makes me especially wary.

A therapist would have to earn my trust in order for me to sign that paper, not just demand that I sign the second we met.