Again, flaws make a character realistic and interesting. Knowing a character's fault can lead to an emotional response in the reader in the form of sympathy. And the more emotional reactions a writer triggers, the better his story will be received. This is a crucial part of characters' development.

Why is having flaws important?

If you can embrace your flaws you can start being more true to yourself by accepting that you are not perfect. It allows you to measure things with the right perspective. In a more general sense, you are framing your reality more soundly and not based on a false notion of self.

How do flaws make you perfect?

Whether it feels like it or not, they do. I encourage you to start reframing how you look at your own flaws and imperfections. Know that they really aren't something wrong with your but in actuality are things that make you the amazing person you are.