You are right. I think removing a particular object is one example where AI really performs great. I remember watching a video on reddit, the guy did remove one thing but later had to manually fill up the surroundings and it took a lot time man. The new Content Aware Fill does really good job with that. But this study mostly focused on editing product photos. So there is more that goes on top of removing objects.
*edit: The study did show the use of the Photoshop background removal tool which didn't change the product's original look and helped to finish the editing faster than a manually edited one.
