Such nonsense. The BG2 beginning is already super dark. BG had his own style. Sure it's not always super dark, but it's dirty and everywhere can be some maniacs or psychopaths and there are Cleary some really dark parts like the beginning.
"release master, I no longer wish to come back"
Bullshit.
Just because it starts in a dungeon and you throw in the words "torture" and "trauma" it doesn't give a particularly dark tone to the entire adventure.
If that was the case Divinity Original Sin 2 would already be orders of magnitude darker than BG2 ever was.
I think "serious and coherent" are more appropriate than "dark" IMO.
There is a huge difference between a world with shimmering colors, with the joker narrator but talking about "serious" topics and a medieval/historical world talking sometimes with a funny ton.
Talking about "dark theme like rape and murder" has no impact if a talking dog, a faerie forest with magic explosive pumpkins and a witch with colorful hat and shinny design are near...
Baldur is a serious medieval world with instants of joke, DOS is a comic world with sometimes "serious topics" but Fort Joy looks more like a regular summer camp than a concentration camp.
The ambiance and artistic style are basic, that’s exactly what we’re talking about here. The "funny" throwing of shoe is unfortunately revealing of the tone, moreover I think a day/night cycle is a less waste of ressources...