Quote - There's that "see" again.
Mathematically correct is not something that can be visually assessed.

I always wondered why the first question that's usually asked of people looking for help in improving their renders in this forum was "Did you GC it?"

I always wondered, if you can't tell and have to ask, how can it possibly matter?

If it matters to you, great.
But I guarantee that almost every single person who posts a render here or in the critique forum asking for help wants to improve the appearance of that render.

I have yet to see anything here entitled "Please help me make my render more mathematically correct."

Possibly some of those who post in threads containing renders of figures floating in space in T-pose are wanting that sort of correction. Good for them.

But I've yet to be paid for getting a naked figure in t-pose mathematically correct.

So I guess I should rephrase my original question: "What's the big deal with gamma correction in the context of how my final render will appear?"