shit won't happen to the color if you applied a casual twisted color system to some vid, it shares the same CIE result like the one with a "scientific" color system anyways, doesn't really matter if the vid is 4:4:4, scientific or not, it always leads to the same CIE value, and that's why matrix like "YCgCo" exists.
but if the vid got a subsampled chroma, that would be a whole new story, the wrong matrix would send some luminance to chroma planes, and chroma planes will be subsampled and we all know what will happen next...
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