It is tiny, but at least with ATLA they visit different villages/cultures and like learn from them and expand their worldview; LoK doesn't bother with this. One of the things I love about ATLA is watching its characters expand their worldview, learning and growing from others, and adding new bending techniques into their own, etc

LoK also took a massive dump on the sense of adventure ATLA had, I was never a fan of 90% of the show taking place in the same modernized city