The same for where people are asking for help or advice, downvotes and upvotes can help crowdsource accurate and useful answers much better. Otherwise you can end up sifting through tens of answers (sometimes hundreds) and not knowing how accurate those answers could be. At least with up/downvotes there can be some semblence of consensus on what's useful and what's not. It also helps prevent a bajillion replies to helpful comments that are nothing more than +1 or "this!".
The exact opposite happened on youtube. Once they hid the downvotes we were unable to recognize relevant content from clickbait.
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