There are several use cases that I've thought of (and many more I'm sure I haven't) that would require the ability to create directories. These directories would need to be filterable/searchable and have customizable subpages. Below are some [Top-level] and [• Subpage] examples of how these directory templates could be used.
Marketplace
Products
Services
Courses
Companies
Link to company profile
Media/resource repo
Images
Videos
Documents