As far as I know, there is no such feature.
There’s a replies auto-deletion system, but only staff can see the deleted message.
The closest using built-in features I think of would be:
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An associated discussion in another topic where feedback is discussed (and the topic would be linked at the top or bottom of the wiki)
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An associated chat channel (but there is no search feature in chat right now)
I don’t know how easy it would be to have a theme component or plugin that would toggle the visibility of the replies (and how the timeline would react to this).