You misunderstood me, my points there are different.
In SO, re-askings are not allowed, but as the question becomes less and less similar at some point it will be allowed. The problem is that "canonical" question for that problem is really just the first one that came along, and there are no good tools for keeping it up to date. It doesn't matter how much karma you have, there are no tools for getting rid of highly upvoted or marked as correct answers that are now wrong / dangerous. So the trick is to find similar but different answers that approach the problem in a more modern way, but haven't been closed as being dupes.
In forums, re-askings are expected and if you ask a JS question 10 years later you will get answers relevant to the time. Posts are not expected to be evergreen, so you can look at when it was asked and have context as to the environment it was asked in, as opposed to SO where the date is sort of meaningless because it's sort of a wiki.
If you know the modern answer, you can downvote the bad old answer, add a comment saying "answer is wrong/dangerous", flag for moderator attention, or edit it and correct the answer, or add your own answer as well even though the question is 'answered'.
Re-asking a question is worse - then there's that big famous first answer with 75 upvotes prominent on Google. And your question/answer with 1 upvote and a "correct" modern answer.
Nobody will find that.
But it's a good point - if you don't know the modern answer and want to, and you can't "re-ask" for new input, then what?
In SO, re-askings are not allowed, but as the question becomes less and less similar at some point it will be allowed. The problem is that "canonical" question for that problem is really just the first one that came along, and there are no good tools for keeping it up to date. It doesn't matter how much karma you have, there are no tools for getting rid of highly upvoted or marked as correct answers that are now wrong / dangerous. So the trick is to find similar but different answers that approach the problem in a more modern way, but haven't been closed as being dupes.
In forums, re-askings are expected and if you ask a JS question 10 years later you will get answers relevant to the time. Posts are not expected to be evergreen, so you can look at when it was asked and have context as to the environment it was asked in, as opposed to SO where the date is sort of meaningless because it's sort of a wiki.