Battery drain isn't here if you have disabled "Mobile data always on" on developer options.
No echo issue here, that should be you carrier.
Bluetooth calls? Who still using Bluetooth calls in 2019? There are better services than it tbh.
Deep sleep is fine or maybe isn't working for you if you have 1000 apps opened at the same time or any other weird things that no one knows.
You don't know what are POWER PROFILES or Air Plane mode.
Well, they don't have luck, if AOSP isn't stable for they, then idk why they are using it, no one forced them to flash and using AOSP, so, don't chill.
Don't use the device meanwhile youre driving a car, it's common sense and safety.
LineageOS 16.0 (14.06.2019) and ResurrectionRemix 7.0.2 (16.06.2019) have 2 bugs in Caller:
1. when the proximity sensor is triggered, the screen is disabled, but the sensor is not disabled
respectively, when touched by the cheek - actions are performed
2. In the speakerphone mode, the microphone does not work.
zerofltexx-userdebug 9 PQ3A.190605.003 eng.enes_a.20190614.114453 testkeys
SM-G925 is Galaxy S6 edge, this is not the topic or ROM for it.