You know, something I like about this series compared to others that have gods-given classes is that the classes seem to be descriptive, rather than prescriptive. That is to say, instead of being arbitrarily assigned and often being a curse, the classes given are ones that genuinely suit the person and their personality. Our prince here, for example, is pressured to be a swordsman, but he genuinely is interested in and enjoys crafting. Likewise, all of the craftsmen we've seen have all loved their work, and all of the mages have been shown to be extremely interested in magic. The angst isn't about being assigned the wrong class, it's just the social stigma attached to certain classes in society.