If they had implemented this at the start it would be good. Right now voting for your own post is the closest you can get to trying to counter the elite that consolidated power. You see it is easy to bypass such a restriction.
Don't want me voting for myself? Fine I can use another account and vote for me. That's how it has been for a long time.
This would potentially have been useful at the beginning but it is super easy to bypass simply by using other accounts.
My biggest problem is hypocrisy. Some big players have actively flagged posts they didn't like to $0 with the claim it was draining the reward pool, only to turn around and upvote their own comments to much larger amounts than that.
Stopping people from voting from themselves won't really fix anything as it is really easy to simply use more than one account.
Many solutions people have proposed are easy to bypass by using more than one account.
But if you were also allowed only one vote for ANY post, you'd need a lot of accounts to do any effective manipulation. No?