Earlier quoted context omitted.
This is a great question! So Ron Edwards, who came up with the GNS system, realized that the there were lots of games about winning, and lots of games about simulations, but very few games about drama/stories. He published his ideas wide and far on the internet, made some games, and ran a very influential forum, "the forge". Along with a later spin off forum, story-games.com, a new breed of game designers showed up t…
Also, incidentally, there's a small group of mainstream RPG fans who get absolutely furious about anything resembling GNS or story games, for no reason I've ever been able to determine. (But then Ron Edwards infamously said that traditional/D&D-style RPGs literally cause brain damage, so I suppose there's a lot of defensiveness to go around...)
In Burning Wheel for exemple, there is no game balance. The knight will absolutely destroy the village-grown militia man, even if they have the same amount of "xp". Also, the complete swordplay game system takes hours to learn just to emulate a few seconds of fencing. They chose realism over smooth gameplay.