I did a search and found any number of articles about cassettes making a comeback, but the why part is almost invariably fudged. They report on why physical formats in general (LPs, CDs, and cassettes) are preferable to some, but they shoot blanks on why some go for cassettes specifically. I did find this story also arguing about the fumbled opportunity that was Awesome Mix: Volume 1. Good for you, Chris Wade of Slate!