There have been efforts to remove vague questions. There is a lot of them. Stack Overflow corporate tends to leave that to the community moderation... which is a bit under powered. Until recently, the elected moderator team tended to be on the preservationist side. As to removing from search?
https://meta.stackoverflow.com/questions/316881/ - remember that Stack Overflow monetization is driven by views. Deleting those vague questions that people search for (they do) that happen to have a lot of views and are locked ends up as a - on the balance sheet.
Reputation changes happen from:
* Upvote on a question you asked (+5)
* Upvote on an answer your provided (+10)
* Accepted answer you provided (+15)
* Accepted edit (+2)
* Down vote on a question you asked (-2)
* Down vote on an answer you provided (-2)
* Down vote you gave on an answer (-1); yes down voting other peoples answers costs you points.
* Receiving a bounty (+varies)
* Giving a bounty (-varies)
Thats it. Nothing about comments. Nothing about closing questions.
The comments aren't necessary useless. They are often trying to help the person asking the question write a better question that can get a better answer. If the comment truly is useless, it should be flagged to be removed (and that won't give or cost anyone any points).
Guessing at the answer isn't that helpful. You've got no idea if it solved the problem or not. The next person to find it with search won't know if it solved the problem or not either. So instead of one question with an answer that did, you've got a question that has a dozen guesses... and you've got to go through and figure out which one works for you in your environment. Might as well have searched a forum and paged through all the guesses there.
Questions that don't have any answers eventually get removed by the system. https://meta.stackexchange.com/a/92006 describes the criteria.
> If the question is more than 30 days old, and ...
> has −1 or lower score
> has no answers
> is not locked
> If the question is more than 365 days old, and ...
> has a score of 0 or less, or a score of 1 or less in case of deleted owner
> has no answers
> is not locked
> has view count has 1 or 0 comments
The "needs more detail" is often part of the close reason. The question is closed not as a "you did bad" but rather as a "don't try to guess at an answer until this is cleared up"
> Questions seeking debugging help ("why isn't this code working?") must include the desired behavior, a specific problem or error, and the shortest code necessary to reproduce it in the question itself. Questions without a clear problem statement are not useful to other readers. See: How to create a Minimal, Complete, and Verifiable example.
> Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
The hides from google, again, is the "this is how SO makes its advertising impression money." The reason given often is the "breaks the internet." If people linked to the closed question from outside that link becomes a 404. I'm skeptical on that being the only reason as I noted the advertising impression dollars there. I personally believe that maintaining poor quality material, no matter how many people link to it, is damaging to the brand and sets a poor example for what people asking questions expect. And thus, when they do catch the eye of someone who has an Atwoodian (quality above all else, delete the stuff that doesn't contribute) philosophy of quality on the site, it becomes a poor user experience for everyone involved. And as Jeff isn't there and Joel is CEO, the emphasis is different.
I say Atwoodian there - thats following the call of:
> It is by programmers, for programmers, with the ultimate intent of collectively increasing the sum total of good programming knowledge in the world. No matter what programming language you use, or what operating system you call home. Better programming is our goal.
The Spolskyians are following the call of:
> What kind of questions are appropriate? Well, thanks to the tagging system, we can be rather broad with that. As long as questions are appropriately tagged, I think it’s okay to be off topic as long as what you’re asking about is of interest to people who make software. But it does have to be a question. Stack Overflow isn’t a good place for imponderables, or public service announcements, or vague complaints, or storytelling.
Its shifted a bit from those original calls to people to contribute... but you can see a profound difference in the emphasis between those different calls for contributors. Then give https://stackoverflow.blog/2011/02/22/are-some-questions-too... a read and look at the editor history of https://stackoverflow.com/posts/1003841/revisions
The thing I'm trying to say there is the "why don't these questions get hidden from google" gets an "its complicated" and goes to the top of the company and its founder about what is appropriate for the site and not. Its not something easily done or decided.