It's a hard question to ask a T because most of the time they really don't know if a client would make a good T (or other professional). They only see certain sides of us and most often it's not a reflection of how we are as students and professionals. That's why you wouldn't ask a T for a letter of recommendation for a graduate program: in most cases they're not in a position to make judgements beyond the state of our mental health general functioning. It sounds so cliched but their job is to guide us in making our own decisions and not to look to people for approval.