For example, this question was originally solved by the OP, which they put within their question. I took the liberty to separate that as an answer.
Since this question has been essentially resolved, but not accepted by the OP, how does that work? Will the answer get accepted over time? We we flag it? Or will it forever be in the digital graveyard of unaccepted questions?
Update: a possibly new feature?
As soon as an answer is upvoted, the question does not count anymore as "unanswered".
As someone who uses issue tracking platforms (such as JIRA), this won't settle well with my need-for-some-closure.
Much like how anyone with 500+ rep can review Q/A by new users, I think it would be worth adding a new feature to allow the community to help put some closure on some questions that were not officially accepted by the OP, but clearly solves the question. Essentially, override the OP and manually accept the best answer.