I have written therapists. For me it is not easier or harder than talking to write it down and send it off. The advantage to me is it clarifies and hones down to the thing I want to say. Sometimes it may be useful for the t to see the thinking process work out on paper, but usually it is to separate the wheat from the chaff and sometimes to get the info away from me - as in I can sleep once I have written it down, edited it, and sent it off.