Which is fine, I just have a pet peeve with false narratives, since things like that can easily spiral out of control.
And while I agree that spider is an example of how these wishes can go bad, the writing and pacing is just so hit and miss after she got out. While she was in the dungeon you never really had the feeling that you only read a cutout of a story. After she gets out, you could really feel the disconnect.
Maybe the manga needed some creative freedom, to make it work better and fix the writing/pacing. But that can also fail badly.
¯\(ツ)/¯