Faggot here from the left.
Avatar the Legend of Korra is actaully shit representation because it focuses on stereotypical lesbian quantities of the butch/femme relationship. Someone has to be the butch or the femme in the relationship or else it's not a "Real" gay experience.
Avatar the Last Airbender actually had cultural influence, and constantly was referenced in chinese culture and other cultures around the world. Putting more into the fact that the world must be balanced by not just one nation, it had to be balanced by multiple of nations to obtain true harmony.
Earthbenders enjoyed the rocks and mud to put forth the foundation of the earth's crust. Fire must burn to light those who are in need of light and fuel our passion.
Water is precise and focusing more on healing and rejuvenation.
And finally Air is free-flowing, enlightenment and concerning about moving within oneself in a spiritual passion.
These are literally shown in the show on a daily baiss, to simply say that Avatar the Last Airbender is less mature than Korra is like saying wearing a rainbow flag on your arm means that you're an ally.