I think it’s because, at least to me, they have failed at every exploratory zone they have made thus far. They always find a convaluted way to do things. It's bad enough that these zones have arbitrary levels, so we added arbitrary grinds to them. Oh, and also stupid rules that only apply to those zones. I'm surprised we keep the abilities we have, and there isn't some terrible pvp centric new skill setup. Even things like Logograms and lost actions are just stupid. They add some convaluted step instead of just showing up to the raid, willing to do it with the skill to do it. You have to bring buffs into it. Now it's like, Wow. And now it's not fun.
At least to me. Eureka and Bozja could be deleted, and their respective rewards added to the game in other ways, and I feel like the community at large would praise it.
As content, it's crystal clear that they failed. It's why Bozja is a truncated form of Eureka, and they never released an EW version. It's because as content, it failed to meet its engagement metric.