It's quite bad, just a grind sending you back into old content to keep you busy. Nobody does primals hundreds of times or westwind 2000 times just for the fun of it. It's something you endure for the prize at the end. The best thing they could do is add relic-specific original content, like they did with Hydra and Chimera. But I understand they don't have all the time in the world. Maybe the last ever relic quest could have an original boss instead of rehashed old content to make it more memorable.