I meant #fff as the nominal white point, which is not the brightest white the device can produce. It's how #fff is displayed on Firefox on an otherwise HDR screen. Assuming the screen is not set to max brightness and otherwise HDR capable, it means that it's not the max brightness an individual pixel/subpixel can produce, so desaturating blue color just to make it brighter can be an unnecessary compromise only dictated by color representation in the software stack.