I think I'd like to see what people would do in their leisure time or domestic work . You see so many stories about travel and war, but you rarely see people interact outside of that. And if you do, it's usually not made unique for a setting that isn't Earth.
What cutlery do they use? What does a morning routine look like? In a world where fire magic is commonplace, how do they cook? How would those things evolve over centuries?
Fantasy especially feels stagnant for this, but I think sci-fi is guilty of this too. Are there things in specific works where an innocuous detail made you wonder more about how a setting worked?
That's a good question. I think atla could have interesting potential to explore waste management.
Earth benders could theoretically salvage any masonry and material made of earth.
Fire benders could melt and reuse metal
It's shame that water benders never really used their abilities to improve waterways and plumbing.
For generations, these people existed in a world where they could move elements and they rarely depicted ways to interact with the world outside of violence.