I guess it depends on what you mean by ambiguity. In my therapy with T we dissect a lot of my thought processes and she never tells me the way I think is "right" or "wrong" she lets me come to those conclusions on my own. So I suppose that could be interpreted as ambiguous in a way? In which case I prefer that. If my T was telling how to think or that a thought I had was "wrong" I would be quite annoyed.