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> I'm not sure why you keep repeating this point.

Because your distinction is wrong.

A drive-by -1 is in no way different from a drive-by +1.

Both are equally useful. Both indicate how many people agree or disagree. Neither explains why someone agrees or disagrees.

They are very different. The explanation for +1 is in the post you are upvoting. Thats why nobody ever has to ask "why the upvotes?'.

Sorry but you make no sense.

If the explanation for +1 is in the post you are upvoting, then the explanation for -1 is just as well in the post you are downvoting.