You can moderate without ever have to downvote given the right tribe settings.
You don't even have to have downvotes in the tribe.
That's exactly the point. Tribe moderation can be done effectively without needing to rely on downvotes at all.
Several of us see within-tribe downvotes as toxic and a weapon that can be easily abused by large stakeholders. We are trying to proactively deal with that issue up-front, openly, and transparently.