The greatest outcome of learning to write well isn’t that you’re better able to communicate with others.
Writing’s most powerful outcome is its impact on your thinking. Writing supercharges your ability to understand your thoughts and circumstances, explore and shape new ideas, and give meaning to your experiences. It gives you the ability to consider widely, dive deep into things that matter, and—as a bonus—you don’t have to worry about remembering what you were working on, because it’s written down!
Of course, it also improves your ability to communicate with other people. But writing makes you a better thinker, and that is its greatest power.