For years, it seemed, digital technology was the ultimate one-way ratchet. There was no going back—only onward and upward (for the optimist), or onward and downward (for the doomer). Not only was digital technology here to stay (where else could it be?), but it seemed destined to inexorably colonize every corner of our lives and our attention, from cradle to grave. The average age of first smartphone fell steadily (it now stands at ten). Smartphones and smartwatches were soon augmented with...
