Color picker

Could someone tell me why the color picker of the Hog line is incorrect?
What is the idea of current color picker? It would be nice to have some kind of explanation of the reasons.

The colors and the degree values don't match.
Is there really any benefit to have differently sized degrees in the picker...
Do we have to bend the rules that way?
For me this has been always confusing.
Also, the picker could have wider range of saturation now it's only from 0-80%