In a webmaster hangout, Google’s John Mueller said that HTML Sitemaps can help Google to index your web pages if your website has a complicated website structure:
“It can definitely make sense to have these kind of HTML sitemaps, which are essentially a mapping of your category and your detail pages. Especially if we can’t crawl a website normally otherwise.
So if you have a really complicated navigation structure, maybe if you have pages that are almost connected just through search forms rather than a logical structure, then at least having one place where we understand the structure of the site, based on the links, that can really help us.
You can view the video here:
HTML Sitemaps also help your website visitors
HTML Sitemaps can help you website visitors to find the right pages on your site. For example, HTML Sitemaps on “404 not found” pages are a good way to keep visitors on your site.
The website audit tool in SEOprofiler automatically creates a sitemap of your website. It also checks your web pages for errors that can cause ranking problems. If you haven’t done it yet, try SEOprofiler now: