You are adding confusion here. When we talk about usage, we mean the posted usage on the phone’s battery statistics regardless of use..and that includes music. It’s part of the usage of the phone.
Why turn off Wifi, LTE, etc. And not use the phone as intended...just to get actual usage statistics, you say? Nope... you have to have them on, use the phone, and yes listen to music and monitor the battery stats in Settings. That’s the correct way...no confusion, no mix-up.
I don't think you understand and that's probably why you think the X has amazing battery life also... I'm saying I literally turned off everything that made the phone work as intended and I still couldn't get anywhere near the times people are claiming they get on these forums.
How can one group of people say they barely get 7-8 hours of use, and another group claim to be getting 12+ hours? It's not possible unless:
1) iOS has a bug which is counting usage times even when the phone is sleeping
2) Apple quality control is **** and people are getting really really bad hardware
3) people are lying, or using music to artificially increase their usage times.
Judging from what I witnessed myself with my X along with all the battery test I've seen, the X only get 7-8 hours of actual screen on use of the device.