Your website is the digital storefront of your business, open to the public 24/7. If something happens that renders it inaccessible, then you’re losing potential customers. When your website is down, every minute that goes by is money lost. You can’t let this happen.
Quite a large number of users modify the files in the parent theme, and that often causes problems. After you update the theme to a new version, you’ll lose your changes and you’ll have to edit the files again.
Blogger is a great free tool to start blogging. However, many Blogger users realize that if they want full control of their blog, then they’re better off creating their own, self-hosted WordPress blog.