For a while now, there have been countless debates and arguments about whether or not HTML sitemaps are even necessary to have for your website when it comes to SEO. Despite this argument, sitemaps can be useful, regardless of how useful you think they might be.
Not only are they useful to users, they do have some additional SEO value. A sitemap tells Google what pages and files you think are important in your site. It even provides valuable information about the files on your site.
Not only do sitemaps help visitors navigate your site, there are other reasons you should include them with your site. Eli Schwartz has seven reasons why you will still need to have one.