I think it’s better to try to keep the upvote/downvote and agree/disagree axis more distinct—to express normative vs positive evaluation. So in this case I would think that downvoting would be the natural way to express disapproval.
I think a downvote-as-disapproval wouldn’t work in this case, I would want to use upvote+disagree to express “this is an important change that the community should know about, but I disagree with the decision”. A downvote de facto communicates “I don’t want people to read this post”.
I think it’s better to try to keep the upvote/downvote and agree/disagree axis more distinct—to express normative vs positive evaluation. So in this case I would think that downvoting would be the natural way to express disapproval.
I think a downvote-as-disapproval wouldn’t work in this case, I would want to use upvote+disagree to express “this is an important change that the community should know about, but I disagree with the decision”. A downvote de facto communicates “I don’t want people to read this post”.