In the latest version of this draft https://datatracker.ietf.org/doc/html/draft-li-apn-framework-04, we provided an illustration section introducing a concrete use case, which covers the APN ID design, the APN ID configuration at the network edge, and the SLA guarantee in the backbone network such as network measurement and traffic steering. The benefits of using APN in this use case are also introduced.
Several concrete use cases that could benefit from APN have also been recorded in IETF drafts and already presented in previous meetings.
https://tools.ietf.org/html/draft-liu-apn-edge-usecase
https://tools.ietf.org/html/draft-zhang-apn-acceleration-usecase
https://tools.ietf.org/html/draft-yang-apn-sd-wan-usecase