Karma change is the best change, and you won't even notice it in the environment where it matters, ie mythic raids. The likability that you can get a full karma in a mythic raid is pretty much non existent as a boss melee hits would instantly rip through your karma and kill you in the process, especially the bosses that hit extremely hard, and there's very few mechanics that deal enough damage for you to stand in to get a full karma either.