Why the mass sharing of the music streaming service’s year-end lists is uniquely telling — If you looked at my Spotify Wrapped summary today and concluded, “You spent a lot of 2019 being sad and/or going on long, moody walks with your headphones,” you’d be correct: Apparently, I listened to a lot of folk-pop singer-songwriter Phoebe Bridgers and her indie rock outfit, Better Oblivion…