I don't often come across a blog post that long that keeps me interested until the end. It's description of systems reminds me a lot of what I've read about cybernetics. I'd love to know what someone who has studied the topic thinks about the way it's explained.
That said, I feel like a few word games had to be played in order to reach it's conclusion; Especially with what I perceive as a somewhat conflated use of the word "purpose".
Perhaps I have to read it through again to make sure I properly understand it.