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I see the upvoting and downvoting feature is available for question threads. Adding this feature to discussion threads makes great sense too. This would help people quickly find the most meaningful info and encourage high quality contributions from late-comers.
That's merely a reaction feature. It doesn't allow to sort posts based on votes or display prominently one or several posts with most votes within a thread.
You would use the Question format. The up/downvote arrows will appear for all replies, answers, discussion, whatever. So in essence, yes, this is already available.