Currently, the skybox class is very limited, seeing as there’s only a few options. Even the number of stars in the night sky is cut off.
Whence the sky is night, it is pitch black, with no ability for customisation. As a result, games with day/night cycles are reserved to the same boring night sky, which eliminates the possibility for things like the milky way in the night sky, or perhaps if the location would be in space, other celestial bodies - stars, suns, moons, and more.
And it’s sad to think that such a seemingly easy task which can be accomplished by transition of skybox images during nightfall and sunrise hasn’t already been done. I believe this feature can be extremely essential to development in many games.