In fact, Facebook lists already do everything he praises Circles for in this article. They might even do a little more (e.g. share with List A, excluding anyone in List B).
As he correctly notes later in the article, the lists feature is not prominent on Facebook, and therefore few use it (or maybe few people actually want it?). But it definitely will not require a major architectural overhaul by Facebook.
As he correctly notes later in the article, the lists feature is not prominent on Facebook, and therefore few use it (or maybe few people actually want it?). But it definitely will not require a major architectural overhaul by Facebook.