Originally Posted by
xAFROx
The short answer is that many of the jobs had a lot more to do in previous expansions.
The longer answer would be pointing out the actual individual changes and removals that have happened to each job over the years. But as someone who only started playing during Stormblood, I'm only qualified to speak of what happened from there on.
Enmity (or aggro) used to be something actively managed by Tanks and certain jobs even had abilities to help with that *cough NIN*....
Healers had a more involved dps rotation (it wasn't much) like for instance, SCH still had a lot of spells from the base dps class of Arcanist.
Tanks used to have a tank stance and a dps stance and they would dance between them in fights to maintain damage and aggro, even having 2 separate 1-2-3 combos, one for aggro and one for damage/sustain/debuff depending on the job.
Dps... well, melee had more of a focus on positionals (particularly MNK) and SAM positionals were mostly tied to kenki generation rather than damage.
That's just stuff I can recall off the top.