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RE: Forum steem
...upgrading just means that your node will switch over if the fork activates, but otherwise it will still continue functioning normally. By contrast if you don't upgrade and the fork does activate, your node will halt. Or to put it another way, under normal conditions there isn't ever a reason to not upgrade a non-witness node (abnormal conditions would include there being multiple competing forks and then it might not be clear what to upgrade to).