FFXIV really needs to look at the formula they're using and really re-evaluate if it's still going to work moving forward (it won't).
Trying to jam in 2 or 3 jobs per expansion was fine when there were still some jobs/niches to explore, but with the removal of Job Quests there's virtually no point in having a 5th tank, 5th healer, 7th melee dps, etc. They aren't differentiated by mechanics generally, they aren't differentiated by abilities, and they're barely differentiated by lore. It's basically just picking a weapon you think looks cool or for a small set of abilities (like Holy or Bloodwhetting). Through leveling classes recently, but WHM feels a lot better than SGE lore wise because you only really get 10 levels as SGE compared to the ~50 you get as WHM. I get why they did it for Shadowbringers and why they do it now (because it's easy) but it's something they direly need to revisit.
Artifact Armor/weapons need a revisit also, tied into the job quest issue you're basically just unceremoniously given a pile of AF gear at level X9 now - which I'm surprised they even still do (and not just have Role Armor) but having the slightest pomp and circumstance around it would be nice. I'm not saying it has to be BRD/PLD levels of tedious - but maybe have it be better integrated into the game? Maybe even upgraded/augmented versions as the expansion goes on instead of it just being a miniscule speed bump that gets discarded near-instantly.
Leveling also needs a revisit - way too many skills awkward backloaded and changed through expansions. By level 50 would ideally have your whole "kit" even if other higher levels add on it/change it. Level ~32 dungeons and such don't have to be difficult, but everyone should have AOE by then.
I have no idea what job would get into FFXIV next but currently I'm not excited for it because it'll likely just be bland garbage barely discernable from its peers. It's weird to think they need a Cataclysm style patch but it's looking that way.