No, it doesn't.
Downvote means “this post is not a productive contribution to the discussion”.
Disagreement may be a reason for that, but it's far from the only reason.
> Leaving it at a downvote only lets us know somebody disagrees and no new dialog can be had about what other ways something could be viewed.
If a comment presents a productive platform for on-topic dialog, then comment and don't downvote.
Downvoting is for things that don't do that.
No, it doesn't.
Downvote means “this post is not a productive contribution to the discussion”.
Disagreement may be a reason for that, but it's far from the only reason.
> Leaving it at a downvote only lets us know somebody disagrees and no new dialog can be had about what other ways something could be viewed.
If a comment presents a productive platform for on-topic dialog, then comment and don't downvote.
Downvoting is for things that don't do that.