For a show that was never a ratings smash during its nine-year run, “The Office” has experienced an astronomical afterlife. In fact, it had a second season thanks only to an NBC executive staking his reputation on its potential. But “The Office” — a drabby workplace sitcom that debuted in 2005 and was adapted from Ricky Gervais’ crueler British mockumentary series — has become Netflix’s most-watched show. It clocked 45.8 billion viewing minutes last year, according to Nielsen. That’s 14 billi...