Alright - I'm only just starting my decision theory textbook so I'll readily admit I probably used the word incorrectly. But I thought that the point you were making is that LessWrong hadn't changed my thinking on a major topic if it was my utility function that had changed. Under this definition though, of a utility function just being the most compact description of what your acts imply you value, changing my beliefs (in the informal meaning) has caused my utility function to change. LW has changed my thinking on the important topic of life goals, and that's the point I was making.