Not having to manage and deal with all the images people send you all the time is not a novelty. Smartphones all assume that every picture you have on your phone is a prize that you want to save forever. Snapchat gives people a way to send pictures that just avoid all that.
See that's what I'm saying. Someone texts you a photo, it doesn't go into your photo list. It stays in your text convo. I'm all for data management and removing clutter, but I can think of 500 items to clear out before I consider private photo messages from my closest friends.