Knowing your weaknesses allows you to understand how you can work around them. Strengths and weaknesses are part of being self-aware. When you know your strengths and weaknesses, you can create a development strategy that focuses on your specific development needs.
My only weakness is worrying about being wrong when presenting to a broad audience. I work to improve this problem by doing more research on a particular topic. I also enhance my self-confidence by actively debating with people who don’t have the same political views.