Quote - > Quote - Pardon the stupid question, but is it a hard and fast rule that GC has to be set at 2.2 if you're using a PC?

Couldn't it be set at 1.2 or 1.3 if less of the effect were desired?

Good question actually.  There's no hard and fast rule that GC has to be set at 2.2 if you're using Windows.  We use the gamma values of 2.2 for Windows and 1.8 for MacIntosh because that's what most monitors have.  I don't see why you can't experiment with other gamma values.
 

Here's why.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

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[it is clear that humans have contempt for that which they do not understand] 

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