> because it adds nothing substantial to the discussion.
Substantial to whom ? Often people who downvote will prvoide additional information as to their reasoning which can be substantial or insubstantial like any other comment.
If a downvoter didn't share their reasoning already, it's unlikely they will be prompted by a general "why is this getting downvoted?" comment. That's why site rules say you should not ask about downvotes.
Substantial to whom ? Often people who downvote will prvoide additional information as to their reasoning which can be substantial or insubstantial like any other comment.