Class changing, are we unique?

[Frederick22]

Hello! So far in the story, I've not seen anybody change class ever. Everyone and their mom seems to have Cure slotted in story fights, but that's about it. :P

Are we unique in our capacity to learn and level all the different classes? Why does everyone seem to only ever do one thing? The first guildmaster lets us loose to join others, but nobody else in the guild ever took advantage of it but us? That seems crazy. If we are unique, why? What makes us special in that regard?

Like, I would advice you to play deeper on the game story and be informed of sereval orther details before asking this kind of questions.