I suppose one downside to using icloud photo library is that then every picture ends up in your library, including screenshots, saves from web pages, etc. I usually limit my library to my own travels, etc. (because then locations, events, etc. are all relevant to me) and put other peoples pictures and other items in Finder folders outside of my photo library. But I am guessing that once icloud photo library is turned on, all photos will end up in the library, at least from iOS devices. Right?