whats old is new again.... one current scenario which calls for static inner IP is when you are using the HPE switches with the 'aruba-vpn' and you want to manage them with Airwave.
Airwave cannot autodiscover the inner IP of a switch, and unlike an AP (which is managed via the controller itself) Airwave needs to have direct IP communication to the switch, ergo it must use the inner IP.
No one wants to have to modify the device in airwave every time it changes inner IP, so most likely use case will be a static inner IP.