@MisterSidternay The mod doesn't necessarily break anything in particular at any particular moment. What the mod does do is it affects your save as the game goes on AND doesn't include any way to clean up old or bad data, and the game itself can't clean it up either. If you want a more technical summary, please see this post:
https://www.nraas.net/community/post75587?sid=257a8d0e8322a6764311e604b5869e1c#p75587
The point is that when playing with the mod, your save is constantly at risk. It could be fine for a while, it could break right away, it could have small problems right away that snowball into large problems later.
I don't tell people what mods they should or shouldn't use, but I do want to emphasize that there's a very large sample size demonstrating that KW causes problems eventually, and that it's not compatible with NRaas mods. If you like it enough to play with it anyway, that's entirely your choice; just understand that there's a trade-off.