Then why did they announce it themselves as a stretch goal for their previous crowdfunded games ? Minimally, this implies someone at Larian shares the idea that D/N would make their games better. Given they themselves stated that they broke their own expectations in terms of EA sales for BG3, it is not unreasonable to ask if perhaps these extra sales could finally allow them to implement D/N in their games.
So please, a lot of people would like a day/night cycle, no need to be condescending toward others because your opinion conflicts with theirs.
Also if you claim others "can't know that" it would help if you refrained from pretending to know yourself what Larian would or should spend their money on.
Whether they announced it as a stretch goal or not in the previous games, considering they did not actually integrate is kind of their answer.