This game has tons of poibtless skills that should be better removed by merging their effects into other skills, lets look only first on all those completely obsolete role skills...
None of them offers anything special, that couldn't be done via updated and upgraded skills from the jobs too, making this way space for alot of new better designed skillls to complement the jobs with more interesting skills.
Then there are pointless skill combos, with certain skills, that are on effective, if used right after a specific other skill, visible through a glittering box around the skill icon. These combo skills should be transformed to the PVP type of function, because it makes no difference if I press constantly in combat rotations of 123 123 123, or if I do 111 111 111, the fact is only, the latter SAVES 2 skill slots, which can be used for more new different skills to make the general gameplay of all jobs more diversive and fun.
Then there are skills, which shouldn't be skills, but better rather some kind of passive traits that change the overall gameplay of the class, than to force the player to press like every 2-3 minutes a button, just to use the effect.
Then there are also skills, that feel like they'd be better upgrades of existing skills, than own individual skills that are rarely used due to too long CDs.
Not to forget that alot got removed with 5.0 out of reason, that should have been kept, or hopefully returns reworked later when we learn new stuff on the way to 90.
Then there exist whyever skills that exist only for Pvp - total idiotical, but sadly fact - which should be brought to PvE gameplay too, I see no logical reason why the jobs need to have Pvp only skills. PvE only makes sense, but not the other way around.
SE made with the Machinist a great, not perfect, but great job. For a perfect job they erased slightly too much skills and among them the best one that made the most fun, the AOE immobile turret that reacted only you with AOE with hit by you targets. The abklity to use turrets together with mechs has to come, then would Machinist truly be perfect. That mechs completely replace turrets is just stupid and feels like as if from 79 to 80 the job completely forgets what turrets are and how useful in combat they can be.
All Jobs should receive the same treatment like Machinist and should get a close look to it, how the gameplay mechanicst and skills/traits can get optimized so that playing them after the changes feels smoother, more fun, technically and conceptionally closer to what you'd expect from these jobs to do in the game.
Summoner n Scholar need finally a complete redesign n cut from each other to be completely individual jobs with summoners not using Books anymore, but instead Warhorns with that they call their summons and which is also summoner headgears in FF have originally horns on top to symbolize the bond with their summons by calling through horns. scholar takes over then all book skins from Summoner.
But the issues with these jobs are only the most obvious elefant in the room. All jobs have their own issues, monk for example feels uninspired and disconnected, which would profit alot from a Machinist Treatment, Astrologist got literally conceptionally destroyed and feels being without identity anymore with its screwed up card system and so on and so forth