I really wish Deep Dungeon weapons were on par with the relic. That's one type of content I wouldn't mind having a long grind in because it's an interesting system. But so long as the reward is just aesthetic or only good enough for alt jobs, the reward isn't as interesting as it could be.
But the real problem with the anima grind is that it's creatively bankrupt. It's just being used as a device to populate queues. The original relic got off to a promising start with two unique trials and asked players to take on the challenge of three hard mode trials (including the wall of Titan). People complained and it's been changed into a long grind with absolutely no challenge ever since.