I think they’re good if they’re in good taste. The author of it has to make sure he gives enough time to the final chapters to resolve all the character arcs so then everyone is happy in the timeskip.
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If everything’s already resolved, though, wouldn’t the timeskip be unnecessary? If there’s a timeskip, shouldn’t it be because not everything can be resolved in the moment—so that we see some resolution in the future?
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Perhaps, like IT. After the Loser’s Club defeats Pennywise, it has an epilogue called Bill Beats the Devil III. His wife had lost her mind to IT, and was the only unresolved character. He gets her back by riding his bike.