For me, a big one is being able to get only the audio stream of a video. Then, I can listen to it while my phone is locked, saving both power and data. This us

For me, a big one is being able to get only the audio stream of a video. Then, I can listen to it while my phone is locked, saving both power and data. This usually requires either a 3rd-party app, or a subscription to Youtube Red, and obviously has no direct analogue on a laptop/desktop.