Ididitmyway, you are bursting no bubbles, I completely agree with everything you are saying (mostly - in my own country Ts also learn more about trauma and attachment than in the US, it seems).

When I said "if they haven't experienced those things personally (and many wouldn't have) I can see how it would be quite one thing to know about them in theory but be completely thrown by their intensity and management in practise" I did not also mean by omission that those who *have* experienced trauma will be better at, and I am absolutely not suggesting that anybody use their personal experience as a therapy template. I don't even know how you extrapolated that from my post. I only meant that those who haven't experienced trauma are not going to 'get' the complexity of trauma and attachment issues at all, and that learning about trauma responses in theory is a whole different kettle of fish to effectively supporting a human being through those issues in a therapy situation.
I certainly agree with alllll your other points about the complexities of human experience, response and a multitude of other factors making work with each individual a very unique experience. Right down to the social experiments about people not challenging long-held beliefs to maintain the status quo. You are preaching to the choir.