I personally dislike (very much!) "Big Reveals" that involve events that pre-date or occur outside of the story. Anything that's that important to the story should be in the story.
On the other hand, one thing I do like is a big reveal that reveals a second interpretation of the events in the story. That sort of thing makes me think.
As far as "Wish Fulfillment" goes -- well, that's the whole point of fiction, isn't it? Well, maybe not all fiction, but a lot of it. If it's handled well it can be a lot of fun!
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