Players enjoying the current iteration of Job is "troublesome"

[Jeeqbit]

If we go by the credits, there are only 3 individuals named for the battle system designer section.
Three.

Expansions release every 2 years (730 days). If you spent 730 days designing 3 new actions for a single job you would be bored for most of those days, so it makes a lot of sense for them to focus on multiple.