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I generally don't think this is a good idea. As you note, status-completed tags work fine for noting that a Meta process has run its course. If such a process has run its course - why not use the s...
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#1: Initial revision
I generally don't think this is a good idea. As you note, status-completed tags work fine for noting that a Meta process has run its course. If such a process *has* run its course - why not use the same post for post-mortem discussion? For main-space questions, if a question is about a problem that should be "obsolete", *that doesn't mean people will stop having to worry about it*. Especially in technical fields: legacy systems are all over the place. The financial sector is still heavily dependent on COBOL. If anything needs to be added, I would suggest (if only for symmetry) allowing for the addition of "outdated" *reactions* on question posts. Which is to say, mark the post with all the information you describe, but don't close it.