The way we think of it, it's equally for both sides, hirers and seekers, and we're just trying to be fair to both. I get that it doesn't necessarily feel that way.
The [-] button is a pretty good solution for long discussions in a job post.
Let seekers share their experience is a pretty useful signal, even if there is no way to know if the seeker is telling the truth. But downvotes are even more secretive and are allowed.