The only thing I don't like in SP is companions talking to each other under the exclamation sign. It's the same thing as it was with DOS1 - I talk to myself again, choosing every companion dialogue options. And it's weird. Since there are origin stories now, allow those companions who have them talk for themselves according to their origins. That way they will finally feel less like dummies.
As for the ability to talk to npcs with any companion - I actually find it cool, because of different attitudes npcs have to each origin and race and subsequently the amount of information they're willing to give them.