Sage much like RPR are unique to FF14 not borrowing from jobs of the past like most jobs and even if this is the case (let me emphasize this)

Past final fantasy iterations should have zero sway over current job design the game has its mold and should only borrow the names not the function. Hurray MCH and SMN play like 1/4 of a party member from FF3 or FF6 but are also shallow as hell