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This sounds more like a fundamental misunderstanding of color spaces (and gamuts) than anything.

Do you mind explaining that? If you increase the brightness of a color space like RGB or HSL, the perceived brightness color increase is different depending on hue.

This is why CIELAB was used, because like the linked HSLuv color space, you can increase brightness across hues with the same perceived brightness shift.

The fact that CIELAB can covert to RGB values outside the usual range is fine, e.g. negative values are fine in wide RGB color space.

Wide RGB color support is almost non-existent.

Every iPhone since the iPhone 7 supports wide color RGB by default...

It depends on how you define "wide color". Yes they use a color space with a wider gamut, but if you're trying to display a regular JPEG image it won't look any different.

Yep, most JPEG images might not look different, however the OS allows RGB values outside the regular range for any color specific API. When working directly with colors, the wide color support is still relevant (and for me, led to the bug I described - devices prior to iPhone 7 didn’t exhibit the bug, because the OS clamped RGB values to the standard range.).

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