Eureka is grindy yes but not even close to as back as Atma collecting, or running dungeons over and over and over with a chance to obtain the drop item at the end. It also doesn't cost any gil, in fact you can make gil while you're in there. This was literally the easiest relic to get, it just took time. No one said you had to spend 8 hours a day in Eureka... of course it's going to be a grind. But if you limit your time in there to an hour or two, set a small goal and achieve it then move on it really is not bad.

The problem is everyone wants everything NOW, so they push and push and push to get the New Shiny. Extreme Primal Farms are also grindy, Savage Learning parties are also grindy. Different strokes for different folks I guess.