I think some of his writing is brilliant, but it is impossible to consistently come up with brilliant material on a schedule. However, if he were to publish a post only when he has enough insightful, original, and quality material, his posts would probably be weeks apart. Perhaps he wants to keep his blog more active than that, and does so by linking to others' writing deemed "good enough" in lieu of his own.

Personally, I like this approach because it exposes the reader to more sources which one can then subscribe to.