You are really trying hard to push irrelevant rubbish, could you stop that? Whether it's voiced or not is irrelevant. And I never said "every conversation constantly". In fact, I said "most". I hope you know the difference between the two.
13k doesn't sound like a lot to me, especially if it's going to be the empty babbling the protagonist showed in the videos so far.
Do you have actual numbers for FNV or are you just guessing? Not that it's any important since FNV very rarely had lines on the level of "WOW THAT SURE WAS A THING".
Really? I'd wager Fallout 2 had more dialogue options than F3 and F4 combined.