You need gamma correction only if your monitor or video card has no gamma correction.
You must remember that not all the video monitors have the same gamma and the value also changes with the intensity settings.
The monitor that I am using in this moment the images look different (worst too much gamma correction) than on my monitor that ended  its life by a shower of sparks in the flyback.
With which gamma you will make the renderings, 1.0, 1.4, 2.2 0.7????

Stupidity also evolves!