What are real usages of physical wwn's in NPIV world?

when we create zones, we should use virtual wwn's not physical ones, and all wwn's, physical and virtual will go through the same fc port.

I'd assume, the FC traffic still would have to locate and go through physical wwn then after arrive at HBA, split to different NPIV's. How internally it works in FC connections? Are there any situations when we need to use physical wwn's in daily administrations?

Are there any ways on the switch side to list those virtual WWN's and their corresponding physical wwn's?

Thanks in advance for your inputs!