Just about the day and night being of equal length, yes, ideally night and daytime events should get the same opportunity. However, the thing is that unless everybody stays out all night, the towns will be quiet at night, and therefore have a lot less to do, there will just be less people to interact with. The maps will feel a lot more empty at night, as NPCs will have gone to bed.
Secondly, night time events are only going to have less opportunity to be preformed if there are an equal number of night-specific events as there are day-specific events. Considering many events will involve NPCs, and people usually sleep at night, we're likely to have less night-specific events, unless we do so intentionally. Which we could, as thievery has to do with night. But unless we have something like thief missions for Link to do at night, I don't know why a shorter night would be to anyone's disadvantage.
Third, small, note, can we have some missions that cause a certain time of day to activate? For example, I know this was mentioned in regards to Niek's farmer subquest, Link might have to help someone escape from Castle Town. It'd be cool if when you agree to help in this quest, day turned to night so you could help them escape under cover of darkness. Some things like that. Anyone else have opinions on the story automatically manipulating the day/night cycle?