Correct.     
When customers say DCS is too bright, the customers are being told by Eagle Dynamics staff to turn the Gamma down below 2.2  when we should be using a brightness adjustment.   
When people have calibrated their monitors/gpu, and other games/applications are suitable, there is no reason to make global adjustments just because DCS does not have a brightness adjustment opinion.  Hence my poll and suggestion.   
As well as for VR users, different HMD's have different panel tech so a brightness adjustment within DCS is needed.   
Thank you, 
Monnie