So what's the consensus on the day-to-night cycle?
I think it's the best idea Evo had. It's implemented really well to push the main concept of "challenge". The track becomes this ever changing obstacle, no matter how much you learn the track there's still pressure when you hit a corner without optimal lighting conditions, your looking for that recognisable object/line/point to help you round, very challenging! I think I actually drive best when it's dull, no strong contrast from the light seems to work for me even though the environment blends in a little.
I kind of hoped the actual challenges you sent people would progress in real time, so it changes depending on what time it is rather then (I assume) resetting to the start time whenever someone tries it.