I hate this attitude towards adapting media so much.
Please stop thinking that you know better and that you can improve the original material (or that it needs any improving at all).
If you were truly able to do Avatar better than the original, you would've, you know, came up with an Avatar level phenomenon, you know what I mean? At some point, a product has maintained popularity for long enough that all its decisions should be trusted. I would argue that when people are still talking about it almost 20 years later, it has reached that point.
People adapting media need to come at it from the understanding that they are lower in the hierarchy than the original material and the original creators, and default to adhering to them as much as possible unless a change is inevitable for the media that it is being adapted to. No matter how little you understand why something is there, no matter how much you disagree with any element, no matter how much you thing "whoah I would've done this so much different if I had made it", remember: you didn't come up with it, so don't touch shit.
See I've never been the biggest fan of this argument because it sidesteps around the fact that anime is almost entirely based around 1 to 1 adaptations of another medium and is humongously successful.
The point of adapting to another medium can just be exactly that, that it is another medium with a different set of tools to tell the story.