As I posted here: https://forums.adobe.com/message/9362058
It seems that the camera profile for a Nexus 5x needs to be fixed. I had someone write back and confirm they tested some RAW/DNG images and consistently reproduced the problem.
Every image taken with Lightroom Mobile on a Nexus 5x Android phone is very overexposed and poor quality.
The fastest way I found to fix it so far is to use "Dehaze", and it makes a HUGE difference in the photos taken.
How can the camera profile be updated/fixed?