I just saw a post about how what made Harry Potter so big wasn't the magic school or the setting- it was the houses. A group you are loyal to and can pretend was assigned to you for fundamental, benevolent reasons.
That's a really amazing take. I never thought about that because it's 100% not something I give a shit about, but it seems like it might explain a lot. Like a LOT.
Both behind the scenes and with the fans. It explains so damn much.