Not really. She fought against Tarrlok over his suppressing the non-benders before.
The fact of the matter is, the Avatar can only be effective if they're in complete balance. Aang would not have been able to master energy bending if he didn't master the elements beforehand, and for Korra, having only one element meant that she wouldn't be a "real" avatar, and since being the avatar was her whole identity, having that taken away from her, just when she was beginning to realize what it meant for her to be the Avatar (helping people and fighting for what's right, not using it as an excuse for her actions or as a way to have celebrity status), and even after everything, she still didn't connect to her past lives, even when she needed them most. Like Aang, she connected to them when she had no one else, and that's what Aang tells her when they first meet.
The purpose of the Avatar is to grow with the world, and become closer to it. Yes, it's important for Avatars to master the 4 elements and reach spiritual balance, but they must also become more human with each reincarnation. Aang became more human by willingly giving up mastery of the Avatar state for Katara, and by doing what's right based on his own beliefs rather than what would be right for the world (As Yangchen stated that if war ever arose in her time, she'd sacrifice her beliefs to do what was best for the world). Also, a bit understated, but I think Aang eventually began to come to terms with the idea that people were people, especially once they got into the fire nation and realized that people weren't generally as terrible as they initially thought. This led to clashes with characters like Jet and Hama who felt like the only way to fight was to be as cold and ruthless as they imagined the fire nation to be.
I believe Korra learned that the world is bigger than just benders and bending (which before going to Republic City, again, was the majority of her life, even her interest in pro-bending had to do with bending) not only because she dealt with benders terrorizing non-benders, but also because she fought against people that were desperate to get out from under the metaphorical heel of the benders that essentially ran the world, and I do hope that we see some of that develop further in the future, at least as part of her world view.
The thing is, to me, I don't see how people can hate on Korra's resolution, but be peachy keen on Aang magically getting Energybending to completely work around his "do not kill" values. In Korra's sense, the major conflict of the plot was resolved without the intervention of a third party fixing everything. Korra herself worked past her block on airbending. Aang didn't appear to her in a vision and go "lol, go punch air at Amon". While connecting with Aang and her past selves and being able to fix Amon's bloodbending can seem like a "cop out", I don't see how people can still say that TLA ended well in the same breath.
Maybe if Aang came up with Energybending himself, or maybe having a chat with the first avatar would put him more in tune with the idea of the original benders, but most people have an issue with Korra based on the fact that a third party got involved to resolve the final loose threads. Which is exactly what the Lion Turtle was.
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