Adjusting gamma actually does nothing for pitch-black nights, moderately-dark nights are what make gamma tweaking useful. The whole point of the tweak is to amplify very low levels of brightness to medium levels - you can’t amplify a brightness level of 0. It was always effective just before and after the pitch darkness, and never did anything during total darkness aside from brighten the skybox.
This is a step forward for realism, but a step back for the game’s mechanics. I use the gamma tweak in heavily populated servers because I have to in order to stay marginally competitive. I can say with total certainty that it’s better now than it was before, because it’s useful in every second of darkness.
The only solution to gamma tweaking is to either bring back pitch-dark nights every night, or implement a radical fog-of-war/HDR type of darkness that forces objects (depending on a threshold of distance from lights and the amount reflected by the material) to render at a brightness of 0.