I see that some people have brought up expansion rewards, and I would just like to say that I am in agreement.
Final Fantasy has always taken pride in having a good story, and even in the MMOs, SE is focusing more on this than most other MMOs on the market. Rewarding players with a handful of gear pieces that remain good for the rest of the game seems like a good way to reward players that are interested in these storylines, and also give incentives to finish the storylines for those who are just in it for the gear. Additionally, this gives new players gear that acts as a decent baseline for when they want to go gear-hunting in whichever way they prefer to do this.
Some storyline rewards are sort of good already, while others are horribly underpowered. Rajas is a reasonably good ring for melee attackers, but tamas and sattva are both laughable. The rajas ring should probably be given a slight boost to the existing stats when worn at level 99, but tamas and sattva probably need to be reworked completely. Sattva should probably have -8% (or maybe even -10%) DT on it, +10 shield/parry/evasion and and perhaps convert 2% of damage taken to mp. Tamas should have +10 MAB, +5 cure potency- -10 enmity and probably refresh in addition to boosting the existing stats a tiny bit.
the Aht Urhgan rings are also pretty terrible. One of them is good in a few events, just because refresh is always good, but outside of this, they are nearly useless almost right from the level you can equip them. I suggest making their latent effects always active, which would probably make Balrahn's ring good, but I'm sure it would be fine to add some MAB to it as well. Ulthalam's ring does however require a bit more to be good. Perhaps TP bonus +20, and regain (not as latent effect) in addition to regen. As for Jalzahns ring, I'm not sure how it should be boosted. ranger and corsair are not jobs I know a lot about.
Moonshade is "almost" fine, but I wish it would give you an additional augment, and many of the available augments are completely ridiculous. Either we should be allowed to pick an additional third augment from any of the two groups, or the augments that are currently very bad should be boosted so that the player has an actual choice when making their earring, not just a "am I an idiot or am I not" test.
The three add-on armor pieces are also mostly outdated now, which is a shame, because one of the main reason people play through the story of them is to get the armor. I suspect that letting us add an additional two augments to them, while at the same time increasing the required level of them to 99 would make them worth getting again, at least for some jobs. Perhaps also double the base stats on those items.