I often experience that the first answers to my question bring up important details that do not answer my question, but give important information that takes me another step forward. I then have the problem, that the question itself is not really helpful anymore, cause I would reask it in another way (from my new viewpoint).
What should I do then?
Just edit an "Update" into the question and ask the new, revisioned question? This would let the answers look wrong or outdated.
Another option would be to remove the whole question and reask it with my new knowledge. But besides I do not know if this is possible, this would remove every answer too.
Hope this question is asked clearly and I do not have to reask it :)
So I think the way is to update the question and point out the new point of view and perhaps an updated (more precise/slightly corrected) question.