I suspected their were serious limitations in the engine that caused them to make certain decisions.
Well they can only do what they can do. They should double-down on the other aspects that make their world immersive then.
Companies, like individuals, go through growing pains. Doing a D&D title was a serious step for them. The genre is defined by the crazy level of detail and vibrant lore.
Now even the oldest engines did a day night cycle. Perhaps they need to find someone old school to show them how to do some coding 'magic'.
Bottom line, I would not fault them if is simply not feasible. If this is truly the case, its time to upgrade the engine. It would be embarrassing to show up to do a portrait using a 4 inch paint brush.