Whatever his reasoning may have been, Kibuishi designed these covers carefully and purposefully. His decision to emphasize the scenery of Harry's world comes from his artistic interpretation of the series, and what he chose to unite these seven books was not Harry Potter, but the world he lived in.
The original book covers drew in readers with the emphasis on the story of Harry Potter. He got them invested in the series, but what kept them invested was the intricately written, beautifully described world that Harry inhabited.
This is the aspect of the story that attracts consumers, both new fans and old, to the anniversary covers. The original illustrations drew in readers with the emphasis on the story of Harry Potter. The redesigned book covers attract consumers by showing them the beauty of everything else in the wizarding world, and that is what makes the series truly enchanting.