If a question has no answers and is closed, an edit will necessarily change some of my original intent. I am the OP, and it just wasn't working. How tightly do I have to stay in the box which didn't work?
Let's limit the discussion to "primarily opinion-based" closures. Making it "not opinion based" may require major changes. It may need to change some or all tags.
If your question is unanswered and unvoted upon, there are (theoretically) no limits whatsoever to changing any aspect of that question including, but not limited to, the tags, the property, the question itself or any other part of it.
If you're intending to utterly revise it, however, you would probably be better creating a new question and deleting the old one simply to make the edit history and any comment chain look less weird.
With that being said, you need to be aware that as soon as you post a question, people are probably starting to spend their time working on an answer to it. It's really quite anti-social to not take that into consideration, especially if people have been making comments to try to get a feel for what you're asking about and to formulate the best answer possible.
