Because most of the questions not got any answers. Then most of the visitors would search for solution and they don't get anything.any plan for resolve this kind of problem?
I remember a long discussion about that, but can't find it. People were proposing to have a voting system for old posts with x votes automatically marking the solution, etc., which sounded like it could work. It would also be nice if search results prioritized posts with marked solutions ahead of those that don't.
You might want to edit your original post and put it in the feedback channel. That would help those who control the site see it. I don't think they browse all forum posts.