The other part is of course that clients have boundaries also. I certainly do. I do not use western medicine except in extremely rare cases - and since my person's death, I don't see that I will have any reason to do so in the future at all.
But I don't let an md or a therapist run roughshod over me. I don't answer questions or give them information unless I want to do so. I am not all that curious about them - why would I be? They are tools for me to use and they are acting. They are not real to me and I am not real to them.
Plus - from what I have seen, many if not most, are bat **** crazy themselves, often touchy and unpleasant to deal with in real life, and have a great deal of trouble if someone does not roll over and submit to their persona. I have no need to feed their need for love, approval, admiration etc.