Anyway, in terms of combat...I feel like the two systems aim at achieving different things.
And about those quests, particularly, I must say that I would take D:OS reactivity, free exploration, and its quests that can be solved in multiple ways over Bioware's morality & romance "C&C" any day of the week. I actually felt like my actions as a character had more of an impact in this game.
...I'd strongly disagree that BG2 should be taken as a model for this process. I don't want D:OS to resemble more an IE game : it already does most things in a different way, one that I personnally find preferable.
I really like these points.
Player agency is not the function of dialogue and its reactivity alone, but also of gameplay generally; Which is something I have the impression D:OS excels at, indeed far exceeding BG2.
Plus, apparently you can pull the chair out from under the mayor of Cyseal and watch him fall over? I mean, let's think about this people

However, I feel that D:OS and Larian's future games can certainly be informed by what made BG2 so enjoyable to so many, while still doing things differently and being games uniquely their own.