The lack of night/day cycle is a real heresy, a true immersion breaker. What reason can justify such a choice, except the copy/paste of Dinivity?
It's more important that a throwing of shoe IMO...
Way to be over dramatic.
Not every game needs a day/night cycle. And nothing about 'copy/paste' would be the choice to add or not add it.
A lot of presence or lack of features in BG3 have for explanation the copy/paste of DO mechanics, the day/night cycle is just a another exemple of that.
For exemple, the "Origin Companions" is a good illustration of this mindset and a result is a less immersive story for no-origin main character and a smaller number of NPC compared to BG.
He who breaks a thing to understand what it is, has left the path of reason.