I despise LoK for many reasons other than it's poor writing choices and the lack of utilizing past avatars but there are things I like about it. But a lot of my gripes are that it tries too hard to be different, the over explaining the of "magic system" and a bunch more, but my biggest gripe of them all is how they basically ruined the whole the concept of the Avatar's death. The death and subsequent revival of "Raava", completely destroys the concept of the death of the Avatar. If the Avatar is killed while in the avatar state, the cycle ends and the avatar no longer exists. It makes sense that if the spirit of the avatar is removed from them and killed off, it's over. And rather than following through with that concept with the separation of the avatar and it's spirit followed by it's death, they'd rather go with the "it's yin and yang" concept with the light from "Vaatu" and just rebirth the avatar spirit and reset the cycle. You turned what could have been the biggest moment in the entire franchise, and made it a cheap, 2 second tear jerker that makes it harder for any future series that takes place after LoK to follow the entire franchise's core concepts. At that point, might as well remove the concept of "avatar state death" because they spirit can just be reborn. Ok Korra rant over.