I haven’t finished D:OS2 so I can’t comment on the comparison, but I personally have zero concerns that BG3 will overly incentivise any specific behaviours based on my EA experience. For me, the reward of behaving in a certain way is the satisfaction of roleplay, not just in dialogue but in how we approach tasks, where we go and who we kill or befriend in different playthroughs.
I suspect folk looking to hit the max level cap as early as possible, get all the best stuff for their characters and metagame to maximise the amount of content they see in a specific playthrough, or even just to make encounters easier, might struggle with differential incentives more. My sense is that the game will reward that style of play less than the one I’ve come to enjoy most as I’ve got to know the game, and that’s probably something for folk to bear in mind as they go in.
I should mention that I consider xp and loot as the least relevant consideration as long as there are enough optional xp in total. And there is too much stuff in these games anyway. Much more important is the fact that encounters are so much more difficult if you start a conversation and then it turns into a fight, compared to ambushing the group just in case they turn out to be enemies. And that's a matter of encounter design.
