I notice there are a lot of old questions with "no answers" even though they have been answered in the comments, or implicitly by fixes.
Maybe a user of sufficient karma could click on "suggest retire", so the question could be grayed out or something, perhaps archived -- in some way indicate that it's answered or closed.
For the answered in comments, probably it's better to "repost comment as answer"? And if the question has no answer, well, maybe you'll just have to wait a bit longer to get them answered? For a low traffic site it's not surprising to have questions without answers.
You can also "delete" the question and it won't show any more - perhaps there are some questions that might as well be pruned.
Well, also you can try to give answers to some of those "unanswered". I think hiding decent content is not a solution (but of course some stuff can and should be just deleted).
On this site Q&A functionality is kind of stretched as here we have questions that are actually bug reports. Personally, I'm fine with that, but maybe I'll find some inspiration to style bug reports distinctly different from questions.
Comments