From my clients' perspectives, the issue is not the actual date of the transfer. It is the shock of finding out after the fact. As long as there is appropriate consultation prior to the transfer so that they have the ability to absorb it and say what they need to say, they don't need to know the actual date.
I don't accept.... I've heard the argument before that they may be concerned about someone trying to interfere with the actual transfer. To me, that's a bit rich. They can handle these transfers without worrying about people trying to stop them.
Having said that, the issue is not about knowing the exact date, time or mechanism of the transfer. It's, rather, about having advance notice.