Something “interesting” about the Avatar series, both of them, is that people get grumpy with Korra for having a little bit of representation that didn’t go far enough, early enough, while Last Airbender has NO representation and everybody’s okay with that.
It’s like catching heat for getting a D in trig while your sibling didn’t even take trig (and no one had the guts to even TRY trig when they were in school) but they’re still everyone’s favorite kid.
Or… Steven Universe. A in trig. A+ maybe. People complain their freshman year math wasn’t great. “Why did they take so long to take trig? Why didn’t they take it when they were freshmen? Why didn’t they take it when they were in junior high?!?”
Or they point out the B in art. Or the C in the Life Skills they took senior year to finish out the last semester after they already had enough credits to graduate.
“They could have been MORE.”
Yeah. But instead they were brave enough to be first.
If another show goes further, later, consider the possibility it’s because these other shows moved the starting line.