I don't make promises to T and he never asked me to do so. He makes observations and sometimes suggestions that I am free to evaluate and follow up (or not). I usually like to follow up as that's why I am in treatment, to do things differently and to try things I may not think of by myself. Then I like to report and discuss the outcome, if any.

Imo, promises would only interfere with the freedom that should be part of the therapeutic process. When I follow up suggestions, I do it for myself, because I want to progress for my own sake, not because I promised or think I am expected to do these things.

Of course I make promises to other people in my personal and professional life, I think probably everyone does at times. Sometimes I keep them, and I strive to keep them, but it does not always happen.