Blog sites is a way for the SEO. It is one of the off page SEO that can help in creating the links. it is thus an essential site to create the quality backlinking. Besides, high quality backlinking will also produce high DA too. Thus it is not only advantageous in one way but either way. Here are some of the blog submission sites list for the guide https://www.backlinkslist.com/2018/02/blog-submission-site-list.html