I asked a question, it has no answers and I don't consider it useful anymore. I have a feeling that it would be a waste of time if someone tried hard to make a solution now. Should I better delete it to avoid this situation?
For an unanswered question with few upvotes, I think that self-deletion is absolutely fine. That might be different it there were answers, even if not upvoted, or if the question had a lot of upvotes. So there will always be an element of judgement.