The previous rationale for not allowing manga titles to update (at all) was that it would be confusing for users if a manga's title arbitrarily changed when the source changed it. Presumably, users would care less about this arbitrary change for manga that is not in library, so this provides a path for getting a manga's title updated, and prevents incorrect titles from persisting in the DB for manga that get title updates but aren't in library.
FlaminSarge
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