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If you take the tour, it is clear that you have to avoid questions that are primarily opinion-based.

However, if you navigate through this site, you'll find many great questions closed or locked as primarily opinion-based. Some of them even in the top voted questions of all time for this site.

Opinions can be very useful, specially when they are given by someone who is experienced an knows about the topic. Well, this site is likely to hold the most expert, professional and multidisciplinary GIS community in the world. So, why not listen to their opinions? Wouldn't it be enlightening? Where should you post a GIS opinion based question if not here where you could probably get the best opinions?

Why do we have to avoid questions leading to opinion-based answers? Why closing? Why not simply let the voting system do the job?

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You have asked a lot of questions in your question:

So, why not listen to their opinions?

We would be silly not to. We have no issue with users giving their opinions as part of their answers to focussed objective questions. It is when opinions are asked for that I vote to place questions on hold, because that makes the question open-ended.

Wouldn't it be enlightening?

It certainly can be, and if opinions are given that appear unfounded, we have a post notice that moderators can use to ask answerers to provide references to back up what they are saying.

Where should you post a GIS opinion based question if not here where you could probably get the best opinions?

Questions seeking opinions are welcome in the GIS Chat Room which is the place within the GIS Stack Exchange set aside for this purpose. If it is software recommendations, hardware recommendations or open data recommendations that you want then we also have specialized Stack Exchange sites for those.

Why do we have to avoid questions leading to opinion-based answers?

What's the best desktop GIS?

I think it's X, user A thinks its Y, user B thinks its Z.

We are all entitled to our opinions so there are at least three correct answers to that question, and maybe many more.

The idea of focussed Q&A is to ask a question to which only a single answer is anticipated. It is desired to have multiple answers posted on each question but this is only so the clearest and most comprehensive of the alternative ways to solve that well scoped question can be offered and voted on.

Why closing?

We do not want answerers to be encouraged to base their answers on opinions. We want their answers to be supported by evidence. Closing prevents answers being added. Once the question is re-scoped to a single focussed question that does not solicit opinions it can be re-opened.

Why not simply let the voting system do the job?

We do not want GIS Stack Exchange to be turned into a harbour for polls. What's your favourite colour to put on a map? Who is the most influential GIS blogger? What GIS does raster best? I think X GIS sucks, do you agree, and why? Such questions go rapidly out of date, can be divisive, and the community has shown little desire to maintain them.

Lastly:

if you navigate through this site, you'll find many great questions closed or locked as primarily opinion-based. Some of them even in the top voted questions of all time for this site.

Some of these questions appeared great to me when they were first asked, and while I had no experience of seeing what happened to them over the years, so I can understand why users new to the Stack Exchange network might initially think the same.

However, I think there is no comparison in value between questions that everyone has an opinion on (and will therefore vote on and give a multitude of answers to), and a focussed objective question with one or more clear objective answers that has affected the work of someone today and is likely to do the same to many others in the future. It is the clear objective answers to clear questions that I value on this and all similar Stack Exchange sites.

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    Do you really thing people are asking for questions like "What's your favorite color to put on a map?" I think the issue is more about questions like this: gis.stackexchange.com/q/225807/18189 – dbaston Feb 3 '17 at 14:04
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    I think there's a larger question about the purpose of having a voting system, if votes are to be regularly overridden by a small group of moderators. – dbaston Feb 3 '17 at 14:07
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    I also think the focus on "questions to which only a single answer is anticipated" is responsible for the proliferation of low-quality and uninteresting questions. Questions that have only one possible answer should generally be referred to documentation, not community experts. – dbaston Feb 3 '17 at 14:08
  • @dbaston if questions have answers readily available within the documentation or anywhere on the web then they should not be asked here and are likely to attract downvotes for lack of research effort. – PolyGeo Feb 3 '17 at 20:11
  • @dbaston Closing questions does not prevent them being voted on, and a large number of upvotes on a closed question can sometimes indicate that it may be worthy of trying to salvage via editing. – PolyGeo Feb 3 '17 at 20:15
  • of course it does. Closing questions removes them from the site entirely. – dbaston Feb 3 '17 at 20:16
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    @dbaston There are thousands of closed questions on the site that have been there for years and are likely to remain there in perpetuity unless the community starts to downvote them and their answers into the negatives or votes to delete them. – PolyGeo Feb 3 '17 at 20:21
  • @dbaston You cited a question which I did not vote to close (and probably would not have) but it had a first paragraph and extra question at the end which are what I think contributed to the community voting the way they did. I have edited the question so that it will again go through the review queue to see if the community still thinks it should be closed. – PolyGeo Feb 3 '17 at 20:25
  • aren't unanswered questions deleted from the site after a week on hold? That's been my experience, e.g. gis.stackexchange.com/questions/225342/…. – dbaston Feb 3 '17 at 21:47
  • @dbaston The criteria for question deletion are described at meta.stackexchange.com/questions/5221. The question above was closed (and Roomba-ed) for being too broad, although I would have voted to close it for asking for code without presenting a coding attempt, and not for seeking opinion-based answers which is the subject of this Q&A. If you ever see a question closed that you think should not be then please come here to Meta and Ask A Question so that we can attempt to come to a common understanding about how this site works. – PolyGeo Feb 3 '17 at 22:42
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    @dbaston Even though that question has been deleted, it is possible for it to be considered for undeletion and re-opening, simply by making the case via a flag to a moderator, or preferably via a Meta Q&A here (for community consensus to be more visible), and explaining why you think it was incorrectly closed. – PolyGeo Feb 3 '17 at 22:46
  • Not sure how I would flag it, when the link turns into a 404. – dbaston Feb 8 '17 at 13:33
  • @dbaston you provided a link that all 10k users can follow to see the deleted question. If/when you don't have one then just post a question here describing it and it should be easy to pull out and discuss. Rather than make oblique references to issues via comments perhaps you can pose a Meta question? – PolyGeo Feb 8 '17 at 14:03
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    @Midavalo Meta Q&As like meta.stackexchange.com/questions/117892 and meta.stackexchange.com/questions/5221 and meta.stackexchange.com/a/134047/215590 leave me fairly confident that what I said is correct. 10K users can see deleted questions if they have a link to them, and can search for deleted questions if those deleted questions are their own. – PolyGeo Feb 14 '17 at 3:36
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    thanks @PolyGeo – Midavalo Feb 14 '17 at 4:57

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