That's also why a good moderation team is necessary and important; to fix submissions which are not inherently good, and to boost submissions which are not inherently bad.
There's more than a bit of leftist elitism at work. E.g. I once made the mistake of submitting something from breitbart.com. It never appeared in 'new'.
When I'm logged in, it shows me that I've submitted 5 items. Examining my submissions anonymously only shows 4 items. Perhaps there are 5 if someone has 'showdead' on?
Putin's external propaganda site, rt.com, is OK, heaven forbid that Breitbart be afforded that same privilege.
Similar to the 'flame war detection' that flags posts with more comments than (up)votes.
I think there are a lot of intricacies involved in these systems, and that they can be gamed for personal gain, ala much of reddit.