I agree it's not perfect, but for myself and my family (we all have iPhones, and if you don't have an iPhone in our family, I will happily provide a refurbished one to you) it is superior to all other photo management options out there (Google might shut down Photos one day, Facebook needs no explanation, Smugmug/Flickr UX is woefully inadequate for family photo library management).
One day I hope Apple improves delta/library reconciliation, but for now, it's the best I've been able to find. It Just Works (for the most part).