The main problem is simply that Larian reuses Divinity 2 for BG3. Maybe because its cheaper or because they think the DOS system is better, but the end result is the same, you do not get a D&D Baldurs Gate 3, but a hybrid. Compare that for example with Kingmaker from Owlcat. Sure, it might be because they had no previous RPG platform available, but when they made Kingmaker they made it with Pathfinder rules in mind. Are they exactly as in the PnP? No, but it is very clear that the game is intended to be a Pathfinder game while in the current state BG3 is at best only inspired by D&D.
