I mean, this is an open content collaborative effort, if YOU want your totally not Ringworld not to have a day/night cycle by all means.
My question wasn't clear. I meant what is the game benefit to having this thing have a day/night cycle. If you are trying to replicate an earth-like habitat, a bigger downside would be the fact that the sun is always directly above you.
A normal tree or bush grows in a spherical shape, so as the sun moves across the sky, the cross section of the sun hitting the tree will be constant (ish). But if the sun is always directly above, the solar energy received will be a downward cross section only. So trees that are tall and thin, like pines or spruce will be at a huge disadvantage compared to a tree that is flat and broad. This will have a big impact on how vegetation grows.
Similarly, if you make the night by blocking the sun, then the night sky would be completely black.