Why do most anime and manga sequels usually replace the protagonist from the original series with a new one?

It seems like most anime and manga sequels usually replace the protagonist from the first series with a new one. Why is that?

?2019-02-20T02:04:34Z

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They... don't? Unless you're talking about something like Naruto/Boruto, that doesn't actually happen all that often, most certainly not in anime. When it does happen, it is simply a matter of a formula that worked and they try to replicate its success.