People were asking such questions since at least 1997. Slashdot had the (imo, great) idea of rotating various voting privileges randomly. Raph Levien's Advogato used a network of trusted users and certification which was designed to be resistant against attack. Kuro5hin also had some novel ideas about what was needed to create robust high quality discussion (which turned out to be an obvious failure, but potentially something one could learn from).
But at some point, sites decided that experimenting with stuff like that was unimportant compared to just bringing in more users. Letting everyone vote all the time obviously has huge issues, but it's emotionally satisfying to downvote, so it keeps users engaged.
The people most prone to dominate the site with voting on everything and coordinating efforts, are also the ones which will complain most loudly if they don't dominate the discussion. So just give them what they want.
It worked. Experimenting with self-moderation mechanisms went extremely out of fashion.