FFXIV doesn't have many people dedicated for job design. I know there was a very good post a while ago that compared the number of people dedicated to that for FFXIV in comparison to a number of other MMOs, and FFXIV was quite low, and that was before a number of jobs were added.
Also- I would hope that FFXIV's job designers had nothing to do with FFXVI, because or any upcoming joint event because I expect that wouldn't have helped their workload in FFXIV.