ServerFault and a lot of other SE sites have been around for a decade or more, but technologies advance very rapidly.
I recently came across a ServerFault question with an answer which, although it might have addressed the question when it was posted 11 years ago, doesn't do that anymore. Since the answer reinforces the now-incorrect premise of the question, it's also become misleading.
Right now, the only thing I'm confident will make any difference is to add a comment to this effect below the answer.
But: Is it reasonable to flag an answer or question for being badly outdated? Are there any meaningful actions a moderator can take when they see such a flag?
I wonder if a custom "this is outdated" close reason would make sense (so I'm adding the feature-request tag).