If it had been done this way from the start I'd likely have given it a pass, but it would be really really weird for them to introduce it now, not to mention it would make some past NPC lines seem silly in retrospect (such as Thancred's comment about your "stoic nods" which inevitably gets him another stoic nod from you), and would drastically reduce the impact of a certain thing that happens in the ShB story as well (not saying any more about that one because that's definite spoiler territory)