It would be nice to live in a world that makes sense, wouldn't it? One where you could easily reduce the issue of weapons balance to points on a spreadsheet, defeating the issue of game design with the raw power of maths. Unfortunately we don't live in that world, as backed up by Fallout: New Vegas' director Josh Sawyer—who recently dispensed a grain of wisdom: Balancing is "mostly vibes based".
This uncomfortable reminder was delivered via a recent YouTube video on the developer's channel (thanks, GamesRadar).