Why Comments are Important for a Blog
Comments build the relationship among the readers/ users and the owners/writers. Imagine this scenario; In a blog, readers wanted to discuss several things with other readers and give their opinion to the owner/ writer of the blog. In that case, users search for the comment box of the blog. If there is no comment section, they give up. According to that scenario, one can understand how comments are important to communicate readers/users with the owner/writers.
When users/readers comment on blogs, it helps to create backlinks, which in turn generates traffic. Most of these links are no-follow links and thus, carry little value; however, the process is still helpful.
Quality comments make a blog super in SEO. Generally, there are two ways that comments improve the SEO of a blog