Apple’s new product burst is a useful reminder that the loudest reaction to an unfamiliar product rarely predicts what buyers will do with it. John Ternus has been running Apple for barely six weeks, and already the place is lookin’ busier. Since September 1, Apple has introduced its first foldable iPhone, HomeView in tabletop and wall-mounted versions, plus a whole family of smart-home cameras, thermostats, sensors, a doorbell and deadbolt. Obviously, this stuff was underway before Ternus...