The documentation describes use cases to illustrate how this integration can be used

Reasoning

Sometimes, seeing a device or service integrated into Home Assistant can make you wonder, "Why would I integrate this?" For some integrations, the intended use and benefit are more obvious than for others.

Use case examples in the documentation can showcase the value of an integration.

Example implementation

The motion detection devices of MyCompany are cheap and usable.
When you combine it with their other device you can do x.

Exceptions

There are no exceptions to this rule.