Some tracks don't have night lighting but it would be nice to have night lighting for those tracks in the sim just to better experience the whole time passage and weather and all that. I believe it was iRacing that had this issue with Sebring which really doesn't have night lighting and they chose to put road reflectors all along each side of the track which was a minimal, clean look to enable racing at night.
Would be good for night racing with cars that don't have headlights either, that can be a bit hit and miss ATM when setting race start times.