I am not convinced -- by this article, at least -- that there could only be two kinds of stuff. It sounds like the answer to the question, "why two and not one or possibly three ?" is, "because I said so", and that's not very convincing.

I am also not entirely sure what the Great Reductionist Project is, or why it's important.

Note that I'm not arguing against reductionism, but solely against this post.