I think he must have listened to some of the ideas of the hack Rian Johnson, whose awful movie was the start of the failures of a multi billion dollar ip like star wars, just do the unexpected, for the sake of being unexpected, even if it doesn't make sense, even if people will hate. Fuck the fans and people who invest their time and money in it.
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In the case of GoT they were just bad, they didn't mean to fuck it up like that. But Rian Johnson is known for doing it in purpose, and the dev has basically admitted he did do it on purpose as well. He didn't want to deliver the happy ending everyone was looking forward to. It was too "predictable".
How they think: The one who built it a franchise loved by everyone vs one who fucked it all up:
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