The lack of power adapter bothers me because: first, the cable they are giving you, will not work with your existing chargers, as it is a USB-C to lighting cable and not a USB-A to lighting cable, your old chargers from apple were all AC-to-USB-A. Second, she states “the cable is faster and more modern”. USB-A has been the most used interface basically since it was introduced, and while USB-C is a newer connector, make no mistake the iPhone and its lighting interface are the bottle neck, not your USB3.0-A connection.