Learning about Vance over the last few days has been intriguing (I didn't even know he existed until a couple of weeks ago).
The overall impression I get...
Imagine that for every situation an individual is in, there's a number of different lines of dialogue they can choose (like a romance game).
Then imagine that each response is labeled - there's the kind response or the strong response or the selfish response or the funny response or whatever.
It's as if in essentially every single situation, regardless of any other factors, J.D Vance chooses the asshole response.
And every once in a while, you get the, “I know we were just trying to murder each other, but have you thought about a relationship?” options, which can be interesting when you find out the apocalypse made everyone bisexual, including the robots
Of course this is mostly a 3D Fallout issue. Fallout and Fallout 2 had more intricate dialogues, Fallout Tactics isn't an RPG, and Brotherhood of Steel is obviously perfect and doesn't have any issues.