I tried it on my company's website, surroundtech.com. It just produced a parent node and a very wide tree of child pages. Not useful in any way.
The website is built using a CMS that's part of our product line, which auto-generates a sitemap.xml file. It also automatically produces a Sitemap page: https://surroundtech.com/sitemap. The two tabs of interest are "Cards", which shows how each page would look when shared via social media links, and "Sitemap Tree" which shows the (non-graphical) page tree.
To be fair to the visual tool, our auto-generated xml is just a flat list of urls, and our auto-generated url routing is a flat list of uniquely named pages rather than a /-separated hierarchy. To create our own sitemap page we use the hierarchy that's built into our CMS, which also creates the top-level menu on the site.