User blog comment:BuriedMemory/Roleplaying Rules/@comment-28861328-20140316001021/@comment-3403804-20140316011046

Well, It seems you've misunderstood Chrono here. He didn't state that Genjutsu itself was always a form of retconning. What I think he refers to are cases where one user finds themselves completely overwhelmed by another, and placed in a situation they cannot (or are simply to lazy) to avoid, instead proceed to go with the asinine "X was an illusion all along" sorta deal. WITHOUT proper justification, in that case, Genjutsu would be used as a deus ex machina. That is probably what Chrono is condemning.

I find Kawarimi to be problematic for the same purpose actually, which is why I expect users to actively hint about it. Nothing is as annoying as writing half an essay in order to please Your opponent and devoting effort to a roleplay and then have it thrown in Your face by something as silly as "X Was an illusion all along".