Tolkien your essays; Hemingway your emails
Essays are tangents and rabbit holes and diversions, woven together with lots of unnecessary descriptive words to demonstrate a proficient understanding of a subject you were meant to research in more depth but did not, in place of other pursuits, or could not, because you chose your subject poorly, and so now you must flesh out an arduous ten-page research paper and convince your scrutinizing instructor that you are well-versed in the topic at hand.
Emails are blunt. Say what you mean. Be specific. End it quickly.