> Out of curiosity, what is stopping screen makers from making the entirety of the colour space as defined by the CIE chromaticity diagram its gamut? A display

> Out of curiosity, what is stopping screen makers from making the entirety of the colour space as defined by the CIE chromaticity diagram its gamut? A display can't support the entire space because of the way colours combine. Any light source acts as a point in the colour space, so a 3-colour display can only cover a triangle. That said, wide gamut monitors do exist. They're of limited utility for simply consuming media; because of the chicken-and-egg effect everything produced for mass consumption already targets the reduced sRGB space or an equivalent. However, a wide-gamut display is useful for content generation, especially when targeting print processes that can use spot colours.