Already said it in the other more generic "mega-thread", but imagine the disappointment of finally reaching Baldur's Gate, start exploring its quartiers and streets... and outside of a (possible) handful of scripted events being forced to roam the city only in midday light.
Without experiencing the scenery at night, without all the street lights turned on, with no "nocturnal street encounter" whatsoever, etc.
I have almost a hard time understanding people (admittedly not many) who keep dismissing this sort of "favor" as something they don't care about, frankly.
And this is without going too much into the potential impact on the mechanical side of things.
Completely agree, some encounters could only be had at night, some merchants appear or disappear at night and vampire characters (really liked the enhanced edition characters) become stronger or are only met at these times. A more DnD answer to Astarions problem would have been to steal his masters cloak for instance.
The thiefs guild missions are usually at night, there are loads of nocturnal creatures or mechanics around night/darkness in general, just missing out on these would be too much of a missed chance to have a more serious world in their rpg, not just bloody
In short, I'm sure Larian hasn't implemented it yet but they are working on it.