It wasn't originally my intention for the filter list to become so comprehensive, but it's steadily grown over time as the content on Reddit has degraded. I've

It wasn't originally my intention for the filter list to become so comprehensive, but it's steadily grown over time as the content on Reddit has degraded. I've been building the filter list since it became a feature in RES. Also, while rare, I still do find new subreddits through r/all, so I prefer the "everything but B" to "only A" approach of filtering. I wasn't even aware it was possible to have a whitelist and I'm not quite sure what you're referring to, to be honest. I'm guessing it would be easy enough to construct now that RES supports complicated custom rules, but I think at this point I'm too lazy to. It's far more convenient to be able to just hover over a post and one-click filter a subreddit from the card RES displays.