I would comment on 2 things:
1. Night mode there is nothing wrong with the phone. It's a small sensor as in any phone, Iso is high and shutter speed is long. You have to plan a shot, hold your breath while waiting the camera to finish exposure time and preferably use the timer and a kind of a firm support during the shot. Doing all that you can get satisfying results. What I would improve is the noise and sharpness management and colour rendition. Those are the best in G-cam's night mode.
2. Temperature. Yes the phone gets hot pretty fast because of heat dissipation, but it keeps that temperature for hours and it doesn't throttle. I can play Asphalt all day long without issues. When the game was tough I used to put my Note 8 in the freezer for 10 minutes to make it work again. Rog 2 just runs and runs. So nothing wrong there. I also tried Note 10+. Rog 2 runs better.