Yeah, sorry if I didn't make my point clear enough.
It's really about normal dialogue with NPCs, and NOT about party interaction.
So what is it exactly you don't like about npc dialogues in SP? It seems that the game treats all companions as protagonists, meaning they all can initiate conversations with npcs. Which is fine by me, because some npcs may refuse to talk to some companions but are willing to with others. So this way chances of botching some quest or unwittingly aggroing someone are less likely.
If you don't like that after the conversation another companion can talk about same things with that npc then I don't see a problem either - you won't get a quest twice and may actually learn something new along the way.
