What if, as a compromise (if they really don't want to program in an actual day/night cycle which changes over time), they just had a "day mode" and a "night mode" of the city, and you can switch between them by going to an inn or something?
A DA2-like solution did cross my mind as I was writing my previous post here. It would be better than no night ever, of course... but not the best solution by far. I think the very basic implementation of time of day would be relatively easy to achieve and at the same time have very good pay-off in terms of enriching the game experience. Transitions could be made like in BG1/2 for extra simplicity. Or even simpler, just day/night (BG1/2 had more than two light levels.)