In my opinion, the problem isn't Eureka. It's why people play Eureka. What I gather from my guild members who actually play Eureka (I have never touched it - not even Anemos), is that they feel pressured to play it for the relic.

Why? That has nothing to do with SQEX or whether Eureka is good or bad. It only has to do with one thing. And that is...

Gamers' obession with material reward and progression.

There is almost no reason to grind out top tier gear in this game. You can take on all the content and clear it just fine at MinIL using gear with poor stat balance. If people saw things in terms of fighting for the sake of fighting because it's fun, then there would be no issue. Instead, it's the players themselves and their obsession with grinding out the best gear in the game so they can kill things faster and/or look better that ultimately encourages SQEX to lock relics behind grind. Because it keeps those kind of players playing.

As for me, I don't care. I enjoy the game for it's immaterial value. If I clear a fight, I don't try to go faster for the sake or rewards. All that does is shorten the fun. And why would I shorten it? I'm playing to play. Not to wait around. Instead, I try to make it harder. To challenge myself.

There is SO much content in this game and people are complaining about how boring Eureka is. Well you bring it on yourself. If you're bored with it, go have fun. Because isn't that why you're playing? Or maybe you should reevaluate whether you actually enjoy Eureka or not. Because if you're doing it, there's clearly something about it you enjoy.