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I agree. But there are circumstances where self voting may be useful. For instance, non prophets, development, etc. if the self upvote is going to support a worthy cause, it is ok in my book. But only then. I think that would be such a major change that it would take longer to convince everyone.

But there are circumstances where self voting may be useful.

Everyone has a circumstance @theferalone

Who will define which circumstance qualifies for an upvote?

No one, the culture will should self regulate. Let it be considered abuse and risk downvotes. That's my take on the matter.