There are several types of job mechanics in JRPGs, with games like Final Fantasy III creating the concept and games like Bravely Default refining it. Knights and Dark Knights; Red, White, Blue, and Black Mages; Thieves and other Rogues: all serve to make each player’s experience a bit different from the next. Some jobs are easy to learn but difficult to master, some take a long grind to be worthwhile, and some are broken right out of the box. A job system can make a game simpler or more complex depending on its implementation, and finding the proper balance can be difficult.
Source：https://www.cbr.com/jrpg-job-system-best-things/
