Larian has, at this point, f'd themselves with one or more groups of players. That said, there was no way around that situation to some extent. I think they chose a half-hearted middle ground and have alienated more than they could/should have. No matter what they did there was going to be a group that raged against the game. If they had gone RAW 5e then the DOS1/2 fans would have been mad it wasn't DOS at all. If they had gone full DOS with Faerun plastered overtop then the DnD crowd would have been even more inflamed. They tried to go down the middle and kind of ended up making both sides annoyed in different ways.
I mean the game is called BG3. Nothing to do with DOS to begin with. As far as I've seen no one is saying there's not enough DOS in here. It's more people claiming there's not enough D&D in their DOS game.
For some it's a major issue for me it's few details but I think they would be better of staying faithful to D&D. DOS fans would have never realised there's problem somewhere ^^.
