Downvote mana delegation
Free downvotes were a great step in the right direction, but even with tools that allow you to easily trail people (aka layer 2 solutions), people are still afraid to downvote people, or maybe they would do so for a bit and then stop when they start to get backlash, to quote some people "it's not worth the drama".
I thought for the longest time that downvote delegation wasn't necessary for solving the "I don't downvote because I fear backlash" because abusers can just look up who delegated to who. But perhaps it is necessary after all.
the change is a bit complex as it adds yet another layer in delegation/voting calculation etc.