The ability to write clearly is the most underrated skill all successful people have, according to Dr. Juliette Han in her January 2023 CNBC article https://www.cnbc.com/2023/01/25/harvard-neuroscientist-shares-the-underrated-skill-successful-people-have-especially-introverts.html. The article argues that a person who writes well (is thoughtful and strategic) will also be successful at other things such as public speaking and small talk.
The article provides writing tips/advice. I liked the tip to reduce the work for the reader. One way to do this is to provide information such as why you are writing at the very beginning. Another is to organize the writing for easy reading or even skimming. This all makes me think of usability.