While it is true that you can shoehorn anything into anything else if you try hard enough, there's a point where it loses a lot of what makes it IT. For example, if you took Tactician and shoehorned it into FFXIV, it would lose all its Debuffs other than maybe something akin to Dismantle on one of its abilities (boring), as a Healer Job under FFXIV's current paradigm, it would lose most of its attack spells and would get a slate of variations on "boring heal".
Honestly, Eunie or Valdi's classes would make more fitting FFXIV Healers, though again, largely altered. Valdi's is arguably similar in concept to SGE:
https://xenoblade.fandom.com/wiki/War_Medic
That sounds a lot closer to a FFXIV Healer Job.Technical Heal (Talent Art) - Heal party
Multi Blast - Area heal on hit (Rank 1 Master Art)
Heal Bullet - AOE / Heal
Advanced Cooldown - Field / Def. up (Rank 10 Master Art)
Cure Bullet - AOE/Clear debuffs/Debf. barrier
Vital Bullet - AOE / Delayed healing
Hero-Exclusive Arts
Trickshot, Area heal on hit
Hyper Reload, Field / Def. up
Surprise Beat, Atk down / Machines↑
Collectively, AOE heal, AOE heal, field effect/area heal, field effect defense, AOE Esuna + debuff protection, AOE HoT, area heal, AOE mitigation/defense, and finally a basic attack. Many of the other "attacks" are also AOE heals, so think Assize/Earthly Star/Pneuma type abilities. You'd still need to add a bunch of abilities (because apparently no FFXIV Job is allowed to have less than 25 or so, Role Actions included, so around 20 Job actions, and that's just 9. But there's definitely something there to make a FFXIV Healer out of, especially once you add the obligatory Cure 1 and Medica clones for low levels, as well as the mandatory Raise spell, some CDs, and some kind of Job mechanic/gauge and buttons associated with manipulating/spending it.
Now, you can argue we can change the paradigm, but that has to happen BEFORE Jobs that violate it are added, not the other way around. Otherwise you end up with cases like Blood DK in Cata where they sucked because, while they were what Bliz planned on making all the Tanks INTO, the others weren't that yet, and so were more powerful vs the content than the "reactive mitigation" model Blood DK used.
Clearly - given SGE's design - you can make a class from anything. But there's a point where it is so lacking in resemblance to its original form as to be irrelevant. If SGE had a weapon designed after a Mondo, four of the paper birds, or maybe 8/12 where they're in micro "flocks" in place of each single Noulith, it would still not be Taion, it would be SGE with paper bird Nouliths.
.
EDIT:
Anyway, the point is, I know Ty like XC3's classes, but they don't fit into FFXIV unless altered to the point they aren't even what they are. Taion's class would probably be added as a DPS before being added as a Healer in this game because of how little healing focus it has.
Yes, you CAN add anything to anything. That doesn't mean it ends up as anything but a hollow mockery of its former self.