Well yeah, I mean you can have day/night without schedules, but they seem to be think both must go together.
As it is in Duivinity2 maybe, I mean more related to the story?
Lets say, they tell you to investigate a village before the immediate attack of the dragon. It does make little sense to have scheduled night/day cycles here or that you spend more than a day questioning villagers.
Once the immediate threat is gone, there could actual be normal cycles every ~2-3 hours for example. As it is in many/all other RPG?