I'm still trying to understand what people actually mean when they say they want a day/night cycle...
What do you actually want the game to do? Have a dimmer switch that cycles between light and dark after an arbitrary period of time passes? (This is basically all it was in The Witcher 3.) I don't see how purely cosmetic day/night cycle is that immersive really.
What is the practical implication of "night" as you imagine it?
When Red Redemption 2 has more immersive features than your D&D based RPG, you know you are in trouble.
Complaining about Red Dead Redemption 2 being "more of an RPG" than Baldur's Gate 3. lol. So your complaint is that you want a different game entirely.
If immersion & simulation are the criteria you're using for your definition of an RPG, then Red Dead Redemption 2 is absolutely a hardcore roleplaying game from what I've seen of it. It's so hardcore when it comes to immersion that skinning animals and many other interactions take a painfully long amount of time so that they can be "realistic".
Some people don't like that. Some people like these things to be gamified. If I wanted a true-to-life simulation, I'd go outside and camp for real. lol.
Meanwhile, the Baldur's Gate series is not and never has been a "medieval life simulator" or RPG (by my interpretation of how you're using the term). If that's what you're looking for, I suggest you dust off your copy of RDR2, or maybe check out Kingdom Come: Deliverance or Mount & Blade 2 if you're looking for something more medieval.
Baldur's Gate 3 is more of a narrative game with a focus on Choice & Consequence. It has more in common with Bioware titles (such as Dragon Age, and... uh... Baldur's Gate) and Telltale titles (such as The Walking Dead), and other C&C games (eg Expeditions: Viking, Disco Elysium) than immersive games like Red Dead Redemption, Assassins Creed, Kingdom Come: Deliverance... or you know, Euro Truck Simulator.
