This whole Mob Psycho discussion has been pretty illuminating. I am not looking to tell people how to feel about a show but I am very interested in hearing why people feel the way I do. To that end, this debate has been useful.
I cannot personally cannot see a problem with a writer creating a story as they go along. That just seems to be part of the creative process - which is an organic exercise. The idea that 'good' writing involves planning everything in advance feels very peculiar to me. I don't see what that has to do with a story being good or bad (beyond basic consistency).
The only time I might take umbrage with this kind of story development is in a mystery story which is expecting the audience to correctly solve a puzzle. For a puzzle to be fair the audiences need access to all the information required to solve it. However, outside of that particular context, it seems far less important.
Hell, I wouldn't even really be bothered if the writer had broken an explicit rule they set earlier in the narrative, as long as breaking that rule rewarded some kind of interesting development. Araki ignores his own rules all the time in JoJo's and that doesn't stop the series from being great - in fact the freedom it offers Araki to create as he seems fit is one of the reasons that the series is so enjoyable.
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