Communication is always a two-way street, and it is always dependent on the ability of both parties to do their part.
Back when I worked to coordinate various projects for a living, I had to write many emails that were intended to organize groups of people who were involved in projects and tasks. I found that the amount of precise detail I included in each email was unimportant. These were all highly educated people, but they never read anything other than the first few sentences. Auxiliary detail and second paragraphs simply did not exist for them. Everything was skimmed quickly, and important details went unseen and were the subject of many follow-up questions, even though the information had been provided.
So, in order to effectively organize, I got into the habit of starting my emails with one sentence, stating the point of the email, like this:
"We need to organize a conference call for next week to finalize <blah blah whatever it is we've been working on>."
Then I'd set parameters and bullet point everything in a short list of what I needed from the participants.
Please provide the following to me by 4:00pm on Tuesday (I want it by 5:00 but I know that to get it by then I have to say that I need it earlier):
- documentation needed
- availability
- (anything else that is pertinent)
And again I would remind them of when I needed this information.
This worked. If I needed to relay additional information to the group that did not pertain to this very specific topic (
organizing the conference call), I would write a separate email, rather than stuff the info into a final paragraph. It may well pertain to the same conference call (i.e. "action items for next call") but it needed to be in a new email with a different subject line, easily searchable.
The point here is that the assumption that providing a lot of detail is the same as providing clarity is not accurate. People will skim whatever you write, and confirmation bias will assure that they take away what they want to take away, accurate or not. Providing too much detail gives them more to misunderstand.
Being good at creative writing has little to do with communicating effectively unless you are writing a story or novel. Being good at understanding the limitations of your likely audience is more important.
As noted, these were highly educated people. They were professors of medicine and science, and their limitations were not comprehensive. The limitation for these folks was time, and I would venture to guess that's true in most business communications.