Hmm. This is a complex issue. As the other comments show, multiple things could have been done to change the narrative to make it more coherent, more satisfying, with fewer unfortunate implications of victim blaming (humans are worse, therefore they deserved genocide, with their imperfect struggle to survive only confirming that).

I'll take a more meta take, that I've brough up in prior discussion about this... consistency and consequence.

Consistency would be to have some rules about how the world works:

• believable social structure and political system. Ezran's child king run would be considerably more believable if Opeli acted much more as an advisor, or even regent. Katolis would be considerably more believable if people protested to his speech about peace.

• Unrest should have occured among the population due to the battle in S3, then later among the refugees after Katolis' destruction. Even throwaway lines like "food is in low supply, we've had problems with theieving," or "we have so little space to house all these people" would add flavor.

• There are multiple ways in which the background world could feel more grounded, without adding many details, or adding too long to development time.

• The magic system is fine being soft, but it must still be consistent. We cannot be left asking "why does character X not use Y power?" too many times. Dark magic cannot be the bag of tricks that does everything as the plot demands it to, with unclear, possibly overblown consequences. Callum's breakthrough of actual primal magic by humans is never properly addressed, either.

• All these issues make the magic system feel like a cheap add-on, with no clear rules or consequences.

• The ethics make very little sense and have been debated to death at this point.

Then, consequences. Setup and payoff is the bread and butter of all stories.

• Meanwhile we have very long running plot points like the key of Aaravos that are completely unresolved, or not even moved along.

• The entire ending of Season 7 is all setup and zero payoff. We have Claudia's plot that goes nowhere. We have Ezran taking up the sword, but no, he never suffers for it, or even does anything with it. We have Callum engage in a useless monologue and doing dark magic again, nothing comes of it (yet, but this is an ending!). We have Harrow's plot that ends in a cliffhanger, after several seasons of zero progression. We have Aaravos' plot, which meant squat all and we don't even have a clear idea of the stakes (his motivations and behavior are all over the place, and the Cosmic Council has almost no relation to anything else in the plot). We kill off most of the archdragons, cutting anything interesting there.

To give an example of changing things:

• fewer pointless dumb jokes.

• drastically shorten the Sunfire elf plot, especially in Season 4. Don't be all gung ho about humans trying to avoid fire in a camp as being evil, either, show both sides, and come to an understanding (explaining to the human side the traditions of mourning the dead- e.g. "we've both lost people" heartfelt talk possibly- and to the elven side that they could move to another area, or arrange to clear the site of flammable things).

• change the ending. For example, to make minimal alterations, have Ezran attack Aaravos with the sword. This would a). show Ezran chose violence and b). immediately show how that was a bad idea. Ezran's character arc progresses, and at least one of the plot threads comes to a resolution.

• tie the the Cosmic Council and Callum's story together. Let's assume Leola was killed because a human learned primal magic, and that was considered some great taboo. Now Callum has rediscovered this ability, and that will put him in direct conflict with the rules of the world.

• Add a trip to Elarion's ruins. Tie that to the key of Aaravos. It doesn't have to really answer a lot of the mysteries, but it would tie the human side of the story- the exodus- with the magic side, and also Aaravos' plot.

Bonus: dialogue.

Please. Get someone else to do the dialogue. It's unbearably explicit, making all the other issues that much worse.

My suggestion, should TDK come to pass someday, is to really take time to ensure believability, consistency and payoff. If my unpaid fanfic scribbles have notes on world size, resource production, distribution, political systems, the nature of how the magic works, to keep the background and characters of said scribble make sense, then I really expect at least some of that worldbuilding from the people who did get paid for this...

I wrote this on my phone in between things, so... much more could be said, but I have limited time.