In Last Airbender there is an abruptness to how characters develop aspects of their character. In particular when someone develops their bending.
It is weird because the transition from seeing the thing to doing the thing is seamless for the protagonists in the show and this would be extremely notable irl. But it is never acknowledged that the protagonists never have internalise new skills on screen.
And I cannot parse what it means.
So when Callum, and to a lesser extent Ezran, develop their powers in just this way I am not sure I read that to mean they’re even more special. Because I don’t understand if I supposed to suspend disbelief.
Another thing I’ve thought about a little bit is that Aavaros (who narrates the prologue in episode 1 season 1 apparently???) has at least one arcanum he wasn’t born with as a startouch elf. He had to learn the primal arcanum somehow.
So where does the idea that arcanum cannot be learned come from? People in the world, at least Raylas master and the Dragon King were aware of Aavaros. So certainly some people in the world know arcanum can be gained and they are not spreading that around.
So like, what Callum did is special in that his success is the confluence of potential, training, and most importantly trying at all. Compared to someone like Claudia, who has training in using the primal arcanum, maybe potential to learn it, but would never try, because she knows it is impossible.
That would be a pleasing way to not meet the expectation Callum has got special potential to gain every arcanum.