It means I primarly use Google Photos and seamlessly have every photo in Google Photos backed up on my NAS at home with no extra work. I also prefer my photos to be organized in a folder structure (which I've also automated) and the Drive integration lets me do this.
I have my NAS mounted to my MacBook where I process photos and transfer them to my NAS, the Flickr auto uploadr puts them up on Flickr. I wish this would be possible from my NAS which may be something I am missing.
I suppose you lose the ability to go from Phone -> GPhotos -> Gdrive -> NAS. I'll check out the medium post when I'm home though.