Azure: One of the first things we see KeA do with her expanded powers is cure Shizuku's blindness, and most of the characters don't want to re-blind her after that either. I don't like the idea that it's everything or nothing.
I mean, that's also not an instance of KeA rewriting reality, so it's still not the same thing. Perhaps it shouldn't have to be all or nothing, but it's the choice Bell forces on them. You can either trust her to do what's best for everyone (LOL) or you have to rescue KeA from all of it (or she rescues herself from it because she can't handle the burden, as pretty much any human would be unable to, even an artificially created one). Like, how does she pick and choose when to intervene and when to not? I imagine it's that same dilemma that Demiourgos faced.
And I am sort of with Lloyd in that there's value in overcoming your barriers the hard way instead of having it all gifted to you. That's not a pleasant sentiment, perhaps, but I don't think a world with no difficulties would necessarily be the best thing for everyone. Regardless of how you see it, Lloyd isn't the one to blame for how it played out. And they can still make the world a better place even without KeA's powers, even if it'll be harder. It isn't all or nothing in that regard.