Also the older sky methods like Hosek/Wikie don’t expose them as input sockets.
That’s because the model we implemented precomputes a 512 x 128 sky texture every time there is a UI change, this means that we can’t expose the sliders as input sockets because the model itself asks for just 1 and only 1 input value, meaning you can’t put a grayscale texture in it, because it simply can’t accept multiple values, that’s how it works.