From my point of view, this update is really necessary, because iOS 15.1 is horrible, battery problems, with some applications and many other bugs, as the thumbnails of the photos in the Photo application are really blurry. From what I read on the forums, others have many other issues, which we hope Apple has consulted, where complaints / grievances have been made. Until iOS 15.1 I thought I had made a very good deal, migrating from Android to iOS, but after this update ... I think I feel some regrets after Android ... I hope things will go well for IOS 15.2