This is the standard response to any challenge to therapy orthodoxies. I guess it's a defense mechanism. Therapists do it too. The client must always be seen as a non-expert who only knows their own experience, and even then only through the interpretive filter of their therapist(s).

I've read hundreds of threads on this forum, and other forums too. What could possibly be a better window into the real-time impacts of therapy than this place or others like it? Have also read a lot of professional blogs and books, where therapists reveal their approach and assumptions.

Some of the boundary stuff is self-evident. Everyone knows that therapists disclose little while waiting expectantly for you to reveal all, watching, scrutinizing. Who where has not had the experience of becoming visibly emotional while a therapist just sat there at a distance gaping and peering at you? Some might find this helpful, others harmful, but how can you deny this is a warping of normal boundaries?