Rather than adding both fields, I will rather add an allias-all. Then if ever we add new fields to PostalAddress they will not miss there.
While at it I looked for such issues in other entity views based on PostalAddress. All but PartyExport (accounting) and ShipmentManifestView use an allias-all on PostalAddress.
I think we should do the same for ShipmentManifestView but I'm not sure about PartyExport, though I don't see an issue there using an allias-all too.