Because as far as I'm concerned, the words are still spoken. In terms of the story itself, the character is still saying the same words regardless of which implementation you use.
Unless the words chosen are of extreme low quality (i.e. the nice option is "Okey d00d, I vill halp j00!" I don't think there will be ambiguity either, as I don't think we'll just have generic "Kill" responses. In the E3 preview, there was no option available that made me think "Hmmm, I wonder what that option is about." In fact, the responses still made sense given the context of the situation. In other words, the PC could have said specifically what was listed on the dial, and the context would still have made perfect sense.
I think it has advantages. You just don't see those things as advantages. Unfortunately, the entire gaming market isn't Tigranes. I'm 100% ambivalent about the decision they made, but I can still see potential advantages.
And besides, as far as I can tell, this game is going to be much more of the "Action RPG" type experience, rather than the "true RPG" experience. So IMO, to hold it accountable to a game type that it's not trying to be, is silly.
I guess we'll just have to agree to disagree.