Colorimetry is hard, sure, but the difference I’m talking about is large enough that it doesn’t really matter.
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DIsplay technology is irrelevant. The definition of the sRGB colorspace doesn't care how you implement it. White subpixels are a hack to get better brightness at the expense of color purity, and never help you if you're trying to cover the sRGB gamut.
I posit that any display using white subpixels and assuming subpixel independence (no weird global power limitations/interactions or whatever) that covers the sRGB gamut can also cover the sRGB gamut at identical brightness with the white subpixels always off.
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ok, even though my previous statement was wrong, *that* isn’t necessarily true, since even the purest blue available is close to pure 470nm light, which is well within the range where M and L are significantly activated in addition to S; therefore…
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…a display could hypothetically have a blue subpixel that’s a significantly *lower* wavelength and doesn’t activate M/L much (i.e. its ‘native’ gamut is larger), but if it only needs to cover sRGB, it can do so at a higher brightness by adding in some white
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