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> 
> I don't know if this was the reasoning behind Cinder's system, but I know
> some people object to procedural -2 because it's a big hammer to essentially
> say "not right now". It overloads the meaning of the vote in a potentially
> confusing way that requires explanation every time it's used. At least I
> hope procedural -2's always include a comment.
> 

This was exactly the reasoning. -2 is overloaded, but its primary meaning
was/is "we do not want this code change". It just happens that it was also a
convenient way to say that with "right now" at the end.

The Review-Priority -1 is a clear way to say whether something is held because
it can't be merged right now due to procedural or process reasons, versus
something that we just don't want at all.