Some products win by subtracting features. The other day, my sister told me about a phone I had never heard of. Mudita. She discovered it through a YouTube video by a Finnish creator named Seve. At first glance it looks like an e-reader … which is basically the point. Mudita phones use a grayscale E-Ink display, the same paper-like screen technology used in e-readers like my daughter’s Kobo. The devices intentionally strip away most smartphone features to reduce distraction and eye strain....