Unfortunately D:OS 2 does a horrible job at treating multiplayer as a co-op effort. For example, there are several instances where one player receives massive positive attitude adjustments with NPCs for completing a quest, but the other player does not (even though the process completes the quest for both players, and both players had a hand in successfully completing the quest).
The first Divinity: Original Sin also had this problem, but it was eventually corrected in later updates. We have had a few major patches since D:OS 2's release and I have seen no fixes towards this problem. It is as if the developers are determined to make D:OS 2 multiplayer a PvP experience rather than a co-op one, and to ignore the progress they made in this area in the first game.
Very disappointing, and I have a difficult time seeing myself taking an interest in future projects if this trend continues.