I agree that it’s easy to navigate back and choose the next one in the list. But in some cases, for example photos category which is a place for people to post photos. And people have an habit to skim through all images which may take about 2 or 3 seconds to look at an image, and go to the next one. I’d be a bit pain of navigating back and forth, if he/she surfs 30 - 40 images.