The only thing I can say to not repeat myself ( a lot of threads about this subject already) -> They already did it to some extent. Astarion has a scene where he interacts in the dialogue, shadowheart comments what he says and all this during the PC dialogue with a bounty hunter close to the hag's house. So I imagine the current state is an EA thing an not a design dchoice ^^
But definitely worth pointing it out.
