In this case, the lore is really unfriendly to actually RPing your character among other characters without insisting on your character being a special snowflake. Honestly, it's better for the community to figure out a somewhat consistent way of handwaving the snowflakey-ness of some of the specialized jobs. Either generalize them so that they're accessible to more than one person while still paying some respect to the lore, or assume that every dragoon is a lancer, white mage is a conjurer, summoner is an arcanist, and so forth. It's not ideal, but it's better than having one jerk insist that their character is the One And Only White Mage in the whole of the game's player characters, or insist that all the thousands of players playing one character class are Unique Snowflakes who are the exception to the rule.
