Loot table.
Why would you do an old school content in a MMORPG without loot table ? Give some rare goodies to have and different mobs give different things, even if it's just furniture, glamour or even TT cards, anything.

Also, I'm not sure why boxes instead of a token shop with crafting material, materia, pots, food and stuff like this. I know that lot of things already do that, but i would completly grind mobs in Eureka for this instead of doing daily quests. I'm pretty bad with scheduled, daily type of content, I always lose track of it and end up not doing it at some point.

Party farming at Eureka is pretty chill, don't really hate that type of content.