I noticed the faq on migration What is migration and how does it work?. Under things to consider when migrating it says
Avoid migrating answered questions. The point of migration is to send the question to an on-topic place when it can get answered. If the OP already has an answer, then we've already defeated the purpose of migration and the destination site won't have anything to do with the question. Avoid migrating these questions unless they are of extremely good quality and risk deletion on the current site.
Then I saw this question Is it worthwhile to migrate questions that already have accepted answers?. The accepted answer says
Yes, absolutely! Those questions belong to the other site, accepted or not, because that's the place where they will be useful for other users in the future.
These two are confusing me. Can the faq on migration be clarified more about this issue?