The modern TV landscape is not an easy environment for a network sitcom to thrive, but week after week, Quinta Brunson's "Abbott Elementary" continues to amaze. When the series debuted its second season this past fall, the ratings for the fan-favorite comedy soared, making the premiere ABC's highest-rated comedy telecast in three years (since the "Modern Family" finale). Even now, 12 episodes into its run, the sophomore season is averaging around 9.1 million viewers per episode, when you...