All content doesn't suit all jobs.

SMN is a job that specializes against strong enemies and as you've seen in Abyssea, nothing is really hard enough to field SMNs. The proc issue is the other major hurdle as the jobs with procs are more than enough to kill most mobs.

Your job isn't alone in being snubbed by Abyssea (RNG PLD BST DRG DRK RDM PUP COR and BRD to some extent) given that the bare minimum is more than enough to clear 90% of content. I think SE took into consideration the pre-Abyssean environment and decided to make casual content and a place where anyone could become powerful with the correct key items. Sadly, once the proc system became fully known and Heroes (90cap) tipped things towards being a joke, certain classes started getting shaved off and the system boiled down to a mechanical process of getting procs and sorting drops.

SE cannot promote all jobs to be equal given that well... all jobs aren't equal. The best they can do is to create environments where certain jobs are good for certain events. Variety, as it were.

Right now there is very little variety so it's natural to see a spike in complaints given well... Final Fantasy XI is currently Abyssea Fantasy 3: Blue it and Brew it.

Lucky for you, Voidwatch (and its future additions) will be SMN friendly events given the relative danger of being in AOE range outside Abyssea. A world without Abyssea will benefit alot of classes currently on the downturn.