With Photos for Mac, Apple pulled an iWork: that is, the re-imagining of how you should organize and manage your photos across devices originally wasn't as feature-complete as the now phased-out iPhoto used to be.
That's especially the case if you consider the need to edit location for some photos in your library: it wasn't before the OS X 10.11.3 El Capitan software update that Photos for Mac got this ability.