I worked with someone who used something like a blank slate, though I'm not sure the whole idea of that is really possible cuz things show up even if the T is trying not to let it. I thought it was the way things were supposed to go in therapy so I went along.

Honestly, it wasn't good for me. I needed something supportive and warm. For some trauma work, I have found that a much more active and engaged T works better. I felt like I was left hanging all the time, not knowing what he was thinking or feeling, when I needed to focus on my own healing, not him. I felt dropped and abandoned when in need. That was also what I grew up with. I didn't really see why he wasn't able to see that and see that leaving me stranded was repeating early stuff.

This idea is old and has been criticized within the world where people do this kind of work. For some people, a blank slate approach has proven to be not what is called for. It can even leave someone so alone that it makes things worse.

It doesn't depend on what you are working on and how the T uses that technique.