Actually, what I was driving at was making it the rule that voting is done only by PM. Not sure if both talking about the same thing.
But apparently some players disliked this idea, can't see any reason why tbh.
One of the arguments I tend to make is that I would prefer to stay as close as possible to the tabletop game. There, you vote by secretly selecting a Yes or a No token, and they're all revealed simultaneously.
So in forum terms, yes, this would mean everyone should vote in PM.
However, you're allowed to say whatever you want about your vote. You can say out loud that you'll Approve, but actually cast a Reject vote.
The current way of playing is the best way we have of representing the fact that you can say what you want in public, and you can vote however you want in private, without one having to affect the other.