The voting system is extremely important if not necessary for any sort of forum site. Like phail said you won't be able to find quality content, which means if the site takes off or gains enough followings it will devolve into chaos of shitposting, fake news, and garbage. Of course there still will be good content yes but you won't be able to tell one from another.
This is in my view one thing 2channel-style boards get right. Not everything has to be about "quality content", and it does a bit of a disservice to users to say that they have such little control that they can't tell good content from bad. Humans aren't animals, we don't just take what we're given. Sites like Reddit, HN and Twitter destroy that agency within us, and it's a shame.
Here is an essay by Shii, one of the most well known historians of imageboard culture on the value of anonymity: http://wakaba.c3.cx/shii/