Superficial abilities that are based around visuals and lore to make the job special is fine otherwise the Black Mage wouldn't be in Final Fantasy XIV. All of the Black Mage spells are simply damage spells even though visually they cast fire, thunder, blizzard and Flare mechanically they work the same as other jobs. Visual and lore wise SE can give the Summoner the ability to summon the primal by transforming into it as long as it mechanically in line with other jobs.