2

Let's say that a question was posted and an answer given.

Other comments and answers persuade the OP to clarify and rephrase their question (which is a good thing), altering the direction and tone of the original question significantly enough that as a result, the first answer posted no longer directly addresses the question being asked.

Should the now-obsolete answer be deleted? Or kept if only to serve archival purposes?

3

You can delete answers, but I recommend to use other ways:

In this case, OP need to accept an answer and repost OP's question.
So if I found a question, I rollback the question, and I comment, "you should accept an answer and repost your question".

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