A recent interview with Yoshi P has shed some light on the job development process (and is interesting in general, worth a read)

https://www.impulsegamer.com/naoki-y...vs-lore-story/

The pertinent part is right here

For jobs that form a large part of the player’s game experience, we conceive them upon placing greater importance on the game experience rather than the story. This is because any constraints relating to the story would be detrimental to the game experience. As such, even though the Warrior of Light’s job changes in the movies for each expansion’s story, we don’t necessarily put the new jobs in the spotlight. For Shadowbringers I had requested Dark Knight in order to depict the pivotal role as Warrior of Darkness. In contrast, the new Gunbreaker and Dancer jobs for Shadowbringers were decided upon after I discussed with the battle system team, and we opted to incorporate new jobs for balancing battles, which adequately addressed requests from players.

So, we actually decide the job first and then devise the story so that it fits well within the game’s universe. Each of FFXIV’s elements are not necessarily determined based on a single direction but instead differ depending on whether we wish to place importance on the story experience or alternately the game experience. Of course, I am very grateful that the battle team, who have the first say, kindly consider the mood of the expansion and story direction when reviewing the possibilities for new jobs.
So jobs are decided upon from a gameplay perspective first and then are back-filled to fit the lore and story of the game (which explains why no Gunbreakers besides players and Thancred show up on The First). So for speculation, "story-sense" is low on the totem pole of consideration.