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> And are you really wanting to simultaneously take a call and listen to music? Will the person on the other end appreciate that? Seems like an inconsequential limitation to me.

You could be hosting a party, for example, and want to leave the room to take a call without interrupting the music.

It saves battery by streaming the music from Spotify directly over the internet, rather than through your phone.

It would not drain your phone battery. The speaker is almost always going to be plugged in anyways. And stepping into another room to take a call while others are listening to music isn't all that uncommon.