In general across all content, how much they want to make full sets of weapons is going to require greater and greater investment with each expansion. I noticed for example they never went back and did Primal weapons for the two new jobs. Not only did they not do weapons for the the second set of PvP gear from Stormblood, but the GNB one is just a shrunken down version of the DRK weapon.

Yeah yeah this game makes millions of dollars yada yada though in scope of everything their internal artist are tasked with, even if you compartmentalize it to gear, environments, etc., I can see them wanting to find any area where they can possibly keep scope under control.