[TazeTSchnitzel]

> The fact that a system is widely used when classifying the impact of UV light on melanoma does not imply that it has relevance in another.

You may have a point there. But it is a classification of skin colour as well.

> It's quite regressive to bake an outdated conception of the color theory of race into a standard

Color theory of race? This isn't the Von Luschan chromatic scale, that was used to enforce racial segregation. It's a simple colour selector based on level of melanin.

It's not perfect, sure, but I think it's surely better to allow a choice of skin shades than to make everyone white (the de facto result otherwise). You might object that implementers could make everyone black, say, and that's also true. But either way, you're enforcing a "default" skin colour, and there is no such thing. Different human populations have different skin colours.