I have to disagree. I have done some communication that have involved thousands or ten thousands people. It is always a challenge and takes plenty of time. You have to carefully balance what you can and should tell, how simple message, when, medium, check for ambiguities, not to restrict too much future options/decisions, and so on. Too much specifics and it causes problems. Too little and it causes other problems.
And when you say something, it will be torn apart by people when they are not happy for some reason.