I always feel a bit sad and wistful when thinking about Stack Overflow. It was a great idea and at the beginning it worked well but the moderation culture destroyed the site.
There's too much emphasis on closing questions that are duplicates (when in fact they are not, and technology changes so a duplicate question asked 2 years later is going to get different responses), closing questions because they are too open ended (but those tend to give the most interesting answers) and moderation is both too heavy handed and opaque (no records of deleted comments).
Also, often enough the accepted answer for a question is not the best answer and instead the best answer can be found by looking at other answers or the comments (which I agree with the author should not be seen as ephemeral but are instead critical)
So, all in all, Stack overflow was great when it came out, the concept is good and it could be great but falls well short of that.
There's too much emphasis on closing questions that are duplicates (when in fact they are not, and technology changes so a duplicate question asked 2 years later is going to get different responses), closing questions because they are too open ended (but those tend to give the most interesting answers) and moderation is both too heavy handed and opaque (no records of deleted comments).
Also, often enough the accepted answer for a question is not the best answer and instead the best answer can be found by looking at other answers or the comments (which I agree with the author should not be seen as ephemeral but are instead critical)
So, all in all, Stack overflow was great when it came out, the concept is good and it could be great but falls well short of that.