I wrote the book "Understanding SEO"[1] with Systems Theory in mind.

After the 1000 meeting w people talking about tips and tricks and competing theoretical constructs including bullshit and thoughtcancer constructs like "linkjuice, pagerank, pinguins, pandas, ..." I set out to build a bullshit free theory of SEO. For my own sake - otherwise I would have had to quit my job.

And yeah "All models are wrong, but some of them are useful." Rephrased: It's a model, therefore it's wrong. But we'll, I deem it damn useful.

[1] free for HN: https://gumroad.com/l/understanding-seo/hacker-news/