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Re:Dear YC: Please stop downvoting thoughtful comments you d... by gaius on Friday July 24, 2009 @09:51AM (#721410)
It is not an either/or - you can both vote and reply.

Thoughtfulness has little correlation to the quality of a comment. A one-liner from a subject matter expert is worth more than an entire paragraph of mere hearsay.

Re:Dear YC: Please stop downvoting thoughtful comments you d... by ptn on Friday July 24, 2009 @10:25AM (#721463)
If you replied with a correction, it's implicit that you disagree, and then downvotes would be redundant.

I think one liners, unless they are reminders of something that's universally obvious, are worse than no comment at all, because they can't contain much information.