Class => Job => ???

[Dark-Saviour]

On a lore standpoint they really can't remove classes just like that because of how ARR jobs connect to them but I get it, nobody actually cares about the lore.

I very much care about the lore, which is why I think the whole thing is shaky as-is.

Thaumaturge was about manipulating the energies within and tailored around status effects, buffs/debuffs, etc.
Conjurer was essentially described as an elementalist.*
Then they introduced jobs and, seemingly for purely aesthetic reasons, decided Thaumaturge should become Black Mage and Conjurer should become White Mage, forcing them to become an elementalist and a healer respectively.
*I see the official description now has a bit about conjurers being healers as well. I don't recall reading that bit in the early 1.X era, but I could be wrong; was that always there?

Arcanist is just a mess where half of the class isn't especially supported by their lore, and the other half is just something that they just claim as being a natural extension of their focus/field, but which... logically doesn't seem to be.
Then you go into Summoner which half-assed the summons to give us EGIs and then went out of its way to justify why it couldn't give more EGIs in a lame fashion (Ramuh EGI shouldn't intrinsically be more taxing than Ifrit EGI since a primal's power is entirely random and fluctuates between summonings), and had to drag Allag back into the mix (Tired of Allag for one. And they work better as an 'Old Garlemald' with more focus paid to the Magiteck rather than looking at acual Magicks, IMO).
And Scholar where... You're a scholar because you have a rock and a Faerie. You don't research anything. You don't study anything. The most scholarly thing you do is go someplace your told to and bring back the rock/urn/whatever you've been told to find. But you have a Faerie and act like a medic so... scholar?

Then there's Machinist where, as a player in-game put it recently 'you don't even make any of your own stuff'. Some dude hands you some turrets and additional gadgets and you just use them. Granted, I have issues with trying to force gunner and engineer into one job with no other paths for people that just want one of the two, but you're not even a proper engineer. :-(

Then there's Bard. They technically explain that one, but I still find it a cop-out (especially when Thancred still calls himself a Bard).

[BubblyBoar]

.....

This is more just, they should have just stuck with FF job names to begin with, instead of starting with the class system. It's less trying to fit classes into the jobs being added into them and more that the classes shouldn't have been added at all and 1.0 should have just been jobs to begin with. It's literally a Final Fantasy staple.

That said, WHM usually has had elemental spells, namely wind and holy. SCH is just supposed to be a grey mage of sorts, with Libra tacked on.