As a consumer of a lot of geeky media, I love it when a book or TV show has excellent worldbuilding that involves different cultures with different magics of their own. However, a lot of times I find that those magics and cultures are pretty rigid. One does this. The other does that. It makes for an easy understanding of how magical battles in that world might work, but it’s an unrealistic and rather simplistic view of how cultures and cultural immigration works.