There's certainly nothing wrong with it inherently, especially if you're building a setting from the ground up. It does become stretched, however, when things start to become incongruent with the setting.While there is some truth to that, there is nothing wrong doing so, and it has many positives benefits to start learning or understanding different cultures better.
Since you've used Avatar (more on that in a bit), it would be very hard at this point in time to insert...I dunno, an Egyptian-themed civilization, the reason being that among the conceits of Avatar are that:
-The world is entirely mapped
-There's four key civilizations in the world, each with a real-world antecedent
-This state of affairs apparently lasted 10,000 years
It's not entirely impossible, provided you provide reasons for it (e.g. "in the year 2023 of the Avatar timeline, a small Egyptian-esque kingdom arose in the sands area but was lost to time"), but you've got your work cut out for you.
It's too late in the evening (...fuck, it's morning, actually) to go through that, but everything in that article is basically what SE is doing with FFXVI. Heck, the majority of the FF series is Japanese developers nicking things from various cultures. Don't see that as an issue. Heck, I've already mentioned I write fantasy, cultural appropriation is my bread and butter.The Appropriation of Avatar - Harvard Political Review
American culture likes to identify its heroes and villains; Avatar the Last Airbender creators Koniezko and DiMartino are neither. For me, they are not “canceled.” But contrary to public worship, their work bears harm too.harvardpolitics.com
You're all over the place there.It's not that different skin tones would be "alien" as much as "random". Like, there'd be no point to adding them one way or the other so why bother. While dragons, they're cool, they kidnap princesses and set fire to villages and share their heart with seemingly good princes who turn out to be shitheads and then pair up with scruffy knights in order to take down the princes and then become stars. They're voiced by Shean Connery!
First, adding "who?" Don't bother answering, the "who" will always vary.
Second, references to Dragon Heart aside, as a general rule, different skin tones are still less farfetched than dragons, regardless of setting. Yes, back to Dragon Heart, you wouldn't see many non-European people in the IP, similar to why you wouldn't see too many European people in Raya and the Last Dragon, but either way, the dragons still have worldbuilding. If Raya turned up in Dragonheart, that would be "wait, that's pretty weird for the time period." If, alternatively, I'm watching Dragonheart with zero knowledge, and Draco suddenly swoops in, it's still "wait, dragons exist? Holy shit, this is interesting." Dragons, by their nature, require some kind of justification, or alternatively, be portrayed as so mundane that they don't (and even then, the mundanity is usually explained in of itself - see Discworld for instance).
Well, yes, certain people in certain settings will seem odd, that's absolutely correct. But again, it's easier to justify one thing than the other.It's not like people would be left with mouths agape at the sight of a black person, it's that it just wouldn't do anything for them one way or the other and would seem odd. Like if someone was wearing clown shoes in a non-KH setting for no reason. Not alien, we all know what clown shoes are, just odd and random. Its purpose indiscernible.
Y'know, between the Avatar article celebrating "a world free of whiteness," and you saying "black people are just irrelevant conceptually," I can't say I like where this is going.And not "unbelievable", just "random". Basically the thinking is on a nation by nation basis. White americans, black americans, you're all just as bad. That's the thinking. Dragons have base in our own culture in some regard so there's stories about them you hear growing up, some christian-based, others ancient, but black people are just irrelevant conceptually so when someone goes out of their way to include them it doesn't make sense as to why they'd do that in a setting that's not in actual Africa or something.
Look, I'm tired, so I'll just point out the obvious. Yes, dragons, as a cultural concept, are found in various cultures. Yes, if I write a dragon story based on Culture A, then most of the people in that story are probably going to be from Culture A, rather than Culture B. Dragonheart has Saxons, How to Train your Dragon has Vikings, Raya has various Asian cultures including China, Thailand, Cambodia, and so on. But even then, all those dragons will usually require a level of justification and worldbuilding that ethnicies don't inherently, because dragons aren't real. People are.