The first example comparing the differing fully saturated hues for the same value is what led me to creating my own color-picker. It takes in RGB hex and spits out the equivalent Munsell value and vice versa. I can edit in a human-understandable format and switch it back to standard Hex.

Let's take a dark purple, that's too light: 573F63 The tool converts it in place to 5P 3/4, then we just modify the value (second term) to 5P 1/4 and convert back to hex (#291333). All we have changed is the brightness, Hue and Chroma have stayed constant.

Hex values are horrible to work with, they contain no understandable info. 10Y 8/6 is going to be complementary to 10PB 8/6, without going outside equidistant chroma levels and having matching value.

Check out the demo in the readme.

Edit: https://github.com/germ/munsellScript/