I would like for there to be somewhat for a thread to be closed & pointed as a duplicate (like you see on StackOverflow) and for others to be able to vote up answers.
here is a nice example of this:
Where's the "belongs on serverfault.com" question close reason? - Meta Stack Overflow
sometimes threads on Thwack never die (e.g. I would like to close off the 'tell us your unknown devices' and point them at the idea that supplants a forum posting.)
Or someone tries to followup to a question posed 6 years ago (an answer today doesn't work with NPM 8.5 and the person who posed the question has changed jobs twice...)