1) Assume no prior knowledge of a situation.
2) Provide some context for intent, objectives etc..
3) Greatly simplify the thrust of the message and initially provided only the most highly relevant details.
If you do that - then 'everything else is a detail' - meaning, if someone has a basic understanding of what the situation is, they can go into detail as needed.
If context is not provided, people have no idea what is going on and their professionalism, conscientiousness and curiosity is wasted.
I like the AMZN approach but I'll gather it could be done in a different way.