There are those who are dismissive and even disdainful of Google Photos but the undeniable fact of the matter is Android just does not have a comprehensive, centralized back up solution like Apple/iOS does with iTunes and iCloud. Too many Android users are losing irretrievable, irreplaceable photos and videos because they mistakenly a) just assume that enabling the 'Backup' option in their Settings includes personal data like photos, and/or b) rely on their phone to just always be available but in reality they do get stolen, misplaced, damaged, or the OS becomes corrupted. Google Photos also makes it easier to transfer accounts from one phone to the next, almost seamlessly. So go ahead and keep trashing it, it's definitely not the perfect, full featured photo library manager, but it is a viable replacement for the default Gallery app and for those who don't have any kind of back up solution it takes care of that very important need.