With Google Photos integration you can't see a picture you've taken until the HDR finishes processing, which can sometimes be a while if you've snapped several pictures in a row. You just see a black box while the processing occurs. It's a dealbreaker for me, so I've been using a previous version of NX Camera that removed it for that very reason.
So this port wan't work for you. Try that one: https://forum.xda-developers.com/galaxy-s7/themes/google-camera-portrait-mode-t3736859
Looks like there will be new camera app with pixel 3, it might be easier to drop Nexus support.Sorry for let you guys wait for a long time, Gcam 5.3 drops support for Nexus phones totally(HDR+ profile, common functions), I managed to make it works only in limited JPEG mode, but things does not go through with old method.
Now I have a thought that maybe it will work with Pie, as custom Pie rom for Nexus 5X was out, I will give it a try.
In my experience image quality is the same, or at least very similar. Currently there are some good deals out there on the original Pixel XL and Pixel 2 XL. I'd recommend picking up one of those instead of a 6P.
There's a bit of a hardware lottery with the Pixel 2 XL too, but it's nothing that causes the phone to die. If you can wait about 45 days the original Pixel and Pixel 2 XL will most likely be even cheaper after the 2018 Pixel lineup has been released.
So I tried this out for the first time recently on my 6P, and there was one issue that kept me from leaving my stock Google Camera app for this one. In the stock app when I take an HDR picture, I can see the picture as it's being processed. In this app I only see black until the processing is complete. When taking multiple pictures the problem is exacerbated, naturally, as I find myself staring at numerous black screens for quite a while as they each process.
Is this the behavior of the app on Pixel devices, or is it just how the modded APK performs on non-Pixel devices like the 6P?