[mulmen]

URLs can be manipulated by the user. If they’re human-readable we can explore a site without links.

Consider something like phpbb. There are thousands of instances in the world, all with similar URLs. You might have some management script or bookmarks that rely on this URL structure and you can just change the domain name to use them on a new site.

Ditto for discovering historical blog posts on a wordpress site. Or interacting with a Stack Overflow.