That's incorrect. If you're using the standard color swatches in the mia materials, they don't need to be, or should be, gamma corrected, because the color input is already linear.
I've found myself gamma correcting everything except the reflection color. The default shader is using colors at full saturation(which is kind of weird) so on first glance it seemed ok. I can't say that I've tested it as much as the mia mat though.
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