Hmm...you do provide good examples. Since I'm not very familiar with more story-based RPG systems, I wasn't aware they could get so mechanically involved. This does indeed seem closer to something Exalted could manage.
Still, I think that part of Exalted's charm is that it riffs off of established gaming structures. When I said that it was a gaming system made into a world and not vice versa, I don't mean just that the system maps well to the world, but that the system is partially based on independent, preexistent styles that in turn are forcibly applied to the setting. In a way, Exalted is a partial Tippyverse, to use this forum's terminology. The mechanics Exalted forges into its setting are by and large quite recognizable, and while they're modified to feel Exalted-y they still are very much a part of traditional gaming. Once Burning Wheel derivatives become more popular, I could see a world that riffs off of them being interesting. But currently they aren't common enough for Exalted to get much mileage by referencing them in its world design.