The Pixel (2 and 3) have a picture processing chip designed by Google that makes it the camera to compare against - and that was before night mode came out. (And the chip isn't going to be made available for other vendors, just as iMessages isn't available to others - every vendor has its own proprietary things.)
Add night mode to that chip and you have a camera that takes pictures of things you can't see with the naked eye. (I took a shot the other night, in front of my house, not realizing that the foundation plants in front of the house would be in the shot - all I saw in that area of the screen was black. When I looked at the shot, I could see the differences in the color of the leaves. Add the OIS, and it's truly amazing to someone who started with "develop it yourself" film photography.)