[arthur2e5]

> Also, there's a reason Y has survived since 1900, and it's not because it's an arbitrary decision.

1931. And Y is known to be problematic since Judd (1951) and Vos (1978), with the latest approach being the Stockman & Sharpe 2005 "fundamental" redefinition. This error has real bearing on how narrow-spectrum display works.[1]

[1]: https://sensing.konicaminolta.asia/wp-content/uploads/2018/0...

> I assume it's a reference to the shape of Oklab's L... not close

The "a little skewed" refers to the shape of the L (or CAM "J") axis projected into the 3D XYZ space, not how the values are scaled in 1D (which I have addressed separately as L_r). They will not perfectly match the Y axis and appear bent, even skewed, because they don't just mathematically depend on Y. But they will be quite close and score a good (> 0.90, I guess) correlation coefficient over a set of color samples because they are trying to model the same aspect of human vision. That is still good correlation, and given the limited nature of gamuts you'd still be able to derive some sort of "this much difference means at least this much ratio".