Listening to Spotify with a bluetooth headset is by far my biggest drain on the 5X (~40% per hour). I've come to use the jack cable more and more, and now it's okay[0]. Luckily, I'm not an iPhone 7 user.

[0] "okay" yes, but if people at Spotify would spend more time on battery and network issues than moving menus to weird places, I would be happier. Alternatives are worst, so it's just a matter of giving them money until they work on something you consider useful. As a consumer, this is infuriating.