I believe that a manager with poor writing skills won’t go far in their career. Most of what I done as a manager is writing. Either feedback, specs, comments, aligning expectations or just run-of-the-mill communication requires good and clear writing. I feel I have a long way to go on improving my art. My biggest weakness is not properly adapting my writing style to the task at hand. The language style used to write a RFC is quite different when you are dealing with some interpersonal issue with a colleague.