It's also interesting how #2 is shifting in recent years. These days it is more likely to be someone handing you their phone to change a Spotify playlist and while I touch type Colemak, I tend to swipe type QWERTY on phone keyboards, so it's not as tough now than when it was someone's laptop/desktop running the playlist.

Also, Apple Music's SharePlay is such an interesting modern approach too, where multiple people can control the same playlist from multiple devices.