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I would be against this currently as the Bitshares system (upon which SPS is based) has a track record of working fine using the return (or burn) mechanism. Introducing structural changes to a complicated voting system make it very difficult to predict what the results will be.

If it turns out, after significant experience on Steem, that we think there is a problem which downvotes would help solve, we can add them.

I think it is better not to introduce them to the proposal system. Not only because they are very controversial but also because they can be obtained in a different way.

Unlike the reward system for posts, the SPS does not have manabar or limit in the number of votes. So, if you want to penalize a particular proposal you can give votes to other proposals, the effect will be the same as a downvote. And, as I said, there is no restriction in the number of votes. It is like increasing the threshold for certain proposals.

Well...I can't really agree with that for the simple reason that there may be hundreds or thousands of other proposals (or even more than thousands). Theoretically, yes, you can vote for all of them without worrying about a manabar and this is equivalent to a downvote, but in practice, no not really (also one might even consider RCs at some point).

But the structure of having return/burn proposals is very much like downvotes in practice and it seems to have worked well for Bitshares so I say we should give that solid chance to work before jumping to downvotes.