What are OKLCH colors?

> In the example above, you can see that the OKLCH colors maintain consistent blueness across all of the shades, while in the HSL example, the lighter shades drift to purple and the darker ones muddy out towards grayish.

There is a very clear shift towards green in the OKLCH lightness value change example, enormously more so than any purple vibe in the HSL example.

Clearly being able to select colours of the same perceptual intensity has value, but some of the claims here as to the benefits are exaggerated.

Agreed. The hue changes completely from blue to cyan.

If that's a correct implementation of OKLCH, then it's not something I would ever touch. Something seems to be deeply wrong with however they're calculating hue.

HSL/HSV have issues with perceptual lightness. But not with hues. The hue is constant and doesn't need any correction depending on saturation or lightness.

I think you do usually want to rotate the hue a bit when changing the lightness though. It’s a difficult thing to get right and one of the reasons the tailwind builtin colour palettes are so useful.

You don't. That's not something graphic designers ever do as compensation for perceptual uniformity.

I looked into it a bit more, and it turns out it's a result of OKLCH easily producing colors out of gamut, and then choosing to sacrifice hue accuracy for better saturation accuracy.

That's a fundamental design flaw if you ask me. Changing hue is completely unacceptable in my book.