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This is a very good and underappreciated point. It's also why in MAME we err on the side of giving the user too many knobs to twiddle with our HLSL post-processing pipeline. Do perfectly-calibrated arcade monitors exist? Sure. Were you ever likely to encounter one? Less so.
But there are knowns: The dithering found in Genesis/Megadrive games was specifically because composite NTSC didn't have the bandwidth to accurately represent it, so carefully-selected neighboring luma or chroma values could be used to force more than the normal 9bpp palette.
To this day I'm still proud of the NTSC shader in MAME. In one pass it packs composite samples into RGBA texels at 4x the X resolution, then in the second pass it does an 81-sample-wide FIR filter to extract the Y, I and Q factors back out. With tunable bandwidths for all three.
Totally agree. Not all differences between the un-post-processed result and the real picture are affected by external factors, so those that aren't can be reproduced (close to) exactly. I really respect your attention to detail, it must be a nightmare to make sense of it all.
Oh, it's absolutely been a group effort. I wrote the initial pipe way back in 2011, but had the assistance of someone more versed in filter theory to explain the NTSC math to me. Then the phosphor chromaticity adjustments were from yet another contributor.
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