Eureka at it's core missed the point as to what players wanted, they didn't want an extension to the relic grind aka having to level in a unique zone to reach the point to grind for relic, they wanted a challenge. Eureka's 2 stages have none of this, it's just a zerg.

When you think about it, 2.X's starting relic had it right, unique encounters, that were challenging for the time, Mantictore and hydra 8-man content but then they rolled back and made it grinding content for the sake of grinding.

Relic should feel like something that is earned and takes time but there should be some challenge to it, a challenge that makes players better. not quite Savage level but maybe closer to Extreme Primal content with other options to achieve relic. Relic only having one path of achievement also hurts, if players want to just grind grind grind away, let them have that option but then also provide an option for 4-8, 24 man groups to not only get relic quicker but to also have something they can sink their teeth into.

If SE learns anything from Eureka it should be that relic shouldn't be pure grind, there should be a challenge that goes past spend X hours doing the same thing til you get everything.