Originally Posted by
Reynhart
The problem I have with dungeons is that they can't unlock any content by themselves. In patch 4.2, we had the EX dungeons, Sigma and Byakko.
Dungeons give you i325 gear, and since it doesn't drop weapons and you can't have two rings, you can't reach i325 by dungeons only, thus locking you away from the rest of the content. Sure, it's not that hard to complete your stuff with some tome gear, but if you include tome gear, you create another problem. If you diligently farm tomestones, you already have better gear for all you jobs, without any RNG requirement. At least, 4.0 provided enough gear that you could enter Deltascape without any tome gear.
On the other hand, you can join Eureka right after reaching level 70, with your job gear, and obtain (with some time) enough gear to access every content up to date. And there wasn't any gear before Eureka that was already higher than Eureka.
Edit : Another thing that hit my mind. Sure, Eureka gear may not be the best of all, but, any equal or higher gear except crafting and weapon is weekly locked. That's also a big point for Eureka when it comes to gearing multiple jobs.