It wouldn't need to be too deep of a feature either. I don't think anyone really expects an isometric RPG to have some super involved season, weather or day/night cycle where AI has their own schedules or behaviors depending on the time.
It's more so a feature that adds a little atmosphere to the game, it can alter both race and monster gameplay and just all in all adds a little variety to the game. It's not the end of the world, but it's disappointing at least.
