Also, Google+ offered this for every Android device long before Apple's iCloud backup, Dropbox Uploads, or even Microsoft's OneDrive auto-backup.
Since most people get confused and avoid the feature, I think it makes sense for them to create a separate product called Google Photos which has nothing to do with social.
I've found the feature convenient and look at most of my pictures that way. It's a bummer when I have to connect my phone via USB cable and pull stuff off that way now (especially since Android is now MTP access only, but let's not go down that road...).
Or if someone wants to have a Google Photos URL to share, Google will give an option of "photos.google.com/<one fucking long ugly random URL>" or "photos.google.com/FirstnameLastname<add some numbers or characters because others may want this URL too!>". That's just ugly!