[herf]

I love this work - the OKLab model is really wonderful.

But I think for color pickers, there are cases where "constant lightness" is not the most important constraint. For instance, you might really mean "the most saturated primary in each hue" and then - you may want the most saturated colors to appear on a line (saturated red, saturated blue, etc.). A constant lightness constraint makes these appear in a really unpredictable pattern.

In less saturated colors, this constraint is very useful and feels right, but I think at the extremes it may reduce usability.