What if jobs and classes had specializations

[Enkidoh]

That's not a 'specialization', that's just an alternate weapon type, which is not what the Armoury System allows (unlike FFXI where weapon and Job were separate, here your weapon is your class/Job). Thus why a new weapon type added to the game will inevitably mean a new class or Job specifically for that weapon, the weapon is simply not added to an existing one (this is also why class and even some Job icons depict weapons, it's telling you there and then what weapon is associated with that class or Job).

Also, NIN was never meant to be a tank in FFXI (this is straight from the development team) - it was meant to be a fast-attacking debuff/DPS, until lazy players turned it into a tank by exploiting Utsusemi's Blink mechanic, and then complained when they inevitably were torn apart by enemies that ate through their shadows at once (being actually DPS they had all the defense of a wet paper bag). I'm glad FFXIV does not have any of that nonsense here.

And scythes are a tool for BTN like they should be - the only time here in FFXIV you'll see a scythe used as a weapon is that glamour weapon of Edda's offered on the Mogstation for certain classes - DRK is all about using a great sword (which is pretty telling that a great scythe will not be a future separate class or Job).

So I do not see SE changing this I'm afraid.