There are one or two submitters that I am 99% sure have their tinfoil hat folding instructions memorized and do not submit things that I personally find interesting.
Additionally, there are several mindless attention whoring sites that seem to post a three-layer linked synopsis of what is, to me, a non-interesting story.
Being able to apply some high-level filters might allow people to see the items they are interested in better. It would also allow you to filter out submissions from sites that you read directly.
At the same time, there is something very unique to the approach here, and as valueless as some of the items I mentioned are to ME, they don't really get in my way.
At the least, PG could make another feed for the "new" view.