There are five people on the FFXIV job design team. The lead has been present since at least ARR (possibly 1.x, although I'm not sure if there's a romanization issue in the credits), and there was one new designer added for each expansion from Stormblood onwards. What do you think the odds of the 'job design mindset' changing are when you have a small, relatively fixed group of job designers under the same leadership across multiple expansions? What do you think the odds are that they don't play favorites, have lots of fresh ideas, and are receptive to player feedback?